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diff --git a/pix/i/caution.svg b/pix/i/caution.svg
new file mode 100644
index 00000000000..3b7678dfe6d
--- /dev/null
+++ b/pix/i/caution.svg
@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Generator: Adobe Illustrator 15.1.0, SVG Export Plug-In  -->
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd" [
+	<!ENTITY ns_flows "http://ns.adobe.com/Flows/1.0/">
+]>
+<svg version="1.1"
+	 xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:a="http://ns.adobe.com/AdobeSVGViewerExtensions/3.0/"
+	 x="0px" y="0px" width="16px" height="16px" viewBox="-0.1 0 16 16" style="overflow:visible;enable-background:new -0.1 0 16 16;"
+	 xml:space="preserve">
+<defs>
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+<path style="fill:#FFB844;" d="M6.4,11.1c-2-2.5-3.7-4-3.7-4S0.3,9.5,0,9.8C5,13.1,8.1,16,8.1,16s0.2-0.7,0.6-1.8
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diff --git a/pix/i/grade_correct.png b/pix/i/grade_correct.png
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diff --git a/pix/i/grade_correct.svg b/pix/i/grade_correct.svg
new file mode 100644
index 00000000000..aef9ff69edd
--- /dev/null
+++ b/pix/i/grade_correct.svg
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+<?xml version="1.0" encoding="utf-8"?>
+<!-- Generator: Adobe Illustrator 15.1.0, SVG Export Plug-In  -->
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd" [
+	<!ENTITY ns_flows "http://ns.adobe.com/Flows/1.0/">
+]>
+<svg version="1.1"
+	 xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:a="http://ns.adobe.com/AdobeSVGViewerExtensions/3.0/"
+	 x="0px" y="0px" width="16px" height="16px" viewBox="-0.1 0 16 16" style="overflow:visible;enable-background:new -0.1 0 16 16;"
+	 xml:space="preserve">
+<defs>
+</defs>
+<path style="fill:#99CC33;" d="M6.4,11.1c-2-2.5-3.7-4-3.7-4S0.3,9.5,0,9.8C5,13.1,8.1,16,8.1,16s0.2-0.7,0.6-1.8
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+</svg>
diff --git a/pix/i/grade_incorrect.png b/pix/i/grade_incorrect.png
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diff --git a/pix/i/grade_incorrect.svg b/pix/i/grade_incorrect.svg
new file mode 100644
index 00000000000..27d851bde4f
--- /dev/null
+++ b/pix/i/grade_incorrect.svg
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+<?xml version="1.0" encoding="utf-8"?>
+<!-- Generator: Adobe Illustrator 15.1.0, SVG Export Plug-In  -->
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd" [
+	<!ENTITY ns_flows "http://ns.adobe.com/Flows/1.0/">
+]>
+<svg version="1.1"
+	 xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:a="http://ns.adobe.com/AdobeSVGViewerExtensions/3.0/"
+	 x="0px" y="0px" width="16px" height="16px" viewBox="-1.6 -0.5 16 16"
+	 style="overflow:visible;enable-background:new -1.6 -0.5 16 16;" xml:space="preserve">
+<defs>
+</defs>
+<path style="fill:#FF403C;" d="M12.8,2.7L10.1,0c0,0-1.6,1.5-3.7,4C4.3,1.5,2.7,0,2.7,0L0,2.7c0,0,1.9,1.3,4.6,3.7
+	C3,8.7,1.3,11.6,0,14.9C2.2,12.2,4.4,9.9,6.4,8c2,1.9,4.2,4.2,6.4,6.9c-1.3-3.3-3-6.2-4.6-8.6C10.9,4,12.8,2.7,12.8,2.7z"/>
+</svg>
diff --git a/pix/i/grade_partial.png b/pix/i/grade_partial.png
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diff --git a/pix/i/grade_partial.svg b/pix/i/grade_partial.svg
new file mode 100644
index 00000000000..3b7678dfe6d
--- /dev/null
+++ b/pix/i/grade_partial.svg
@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Generator: Adobe Illustrator 15.1.0, SVG Export Plug-In  -->
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd" [
+	<!ENTITY ns_flows "http://ns.adobe.com/Flows/1.0/">
+]>
+<svg version="1.1"
+	 xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:a="http://ns.adobe.com/AdobeSVGViewerExtensions/3.0/"
+	 x="0px" y="0px" width="16px" height="16px" viewBox="-0.1 0 16 16" style="overflow:visible;enable-background:new -0.1 0 16 16;"
+	 xml:space="preserve">
+<defs>
+</defs>
+<path style="fill:#FFB844;" d="M6.4,11.1c-2-2.5-3.7-4-3.7-4S0.3,9.5,0,9.8C5,13.1,8.1,16,8.1,16s0.2-0.7,0.6-1.8
+	c0.9-2.7,3.2-8.1,7.1-14.2C11.2,3.7,8.1,8.2,6.4,11.1z"/>
+</svg>
diff --git a/pix/i/invalid.png b/pix/i/invalid.png
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diff --git a/pix/i/invalid.svg b/pix/i/invalid.svg
new file mode 100644
index 00000000000..27d851bde4f
--- /dev/null
+++ b/pix/i/invalid.svg
@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Generator: Adobe Illustrator 15.1.0, SVG Export Plug-In  -->
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd" [
+	<!ENTITY ns_flows "http://ns.adobe.com/Flows/1.0/">
+]>
+<svg version="1.1"
+	 xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:a="http://ns.adobe.com/AdobeSVGViewerExtensions/3.0/"
+	 x="0px" y="0px" width="16px" height="16px" viewBox="-1.6 -0.5 16 16"
+	 style="overflow:visible;enable-background:new -1.6 -0.5 16 16;" xml:space="preserve">
+<defs>
+</defs>
+<path style="fill:#FF403C;" d="M12.8,2.7L10.1,0c0,0-1.6,1.5-3.7,4C4.3,1.5,2.7,0,2.7,0L0,2.7c0,0,1.9,1.3,4.6,3.7
+	C3,8.7,1.3,11.6,0,14.9C2.2,12.2,4.4,9.9,6.4,8c2,1.9,4.2,4.2,6.4,6.9c-1.3-3.3-3-6.2-4.6-8.6C10.9,4,12.8,2.7,12.8,2.7z"/>
+</svg>
diff --git a/pix/i/preview.png b/pix/i/preview.png
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diff --git a/pix/i/preview.svg b/pix/i/preview.svg
new file mode 100644
index 00000000000..3271954c770
--- /dev/null
+++ b/pix/i/preview.svg
@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Generator: Adobe Illustrator 15.1.0, SVG Export Plug-In  -->
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd" [
+	<!ENTITY ns_flows "http://ns.adobe.com/Flows/1.0/">
+]>
+<svg version="1.1"
+	 xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:a="http://ns.adobe.com/AdobeSVGViewerExtensions/3.0/"
+	 x="0px" y="0px" width="16px" height="16px" viewBox="0 0 16 16" style="overflow:visible;enable-background:new 0 0 16 16;"
+	 xml:space="preserve">
+<defs>
+</defs>
+<path style="fill:#999999;" d="M15.5,13.4l-2.1-2.1c-0.2-0.2-0.4-0.3-0.7-0.4C13.5,9.8,14,8.5,14,7c0-3.9-3.1-7-7-7C3.1,0,0,3.1,0,7
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+	s1.8-4,4-4c2.2,0,4,1.8,4,4S9.2,11,7,11z"/>
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diff --git a/pix/i/valid.png b/pix/i/valid.png
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diff --git a/pix/i/valid.svg b/pix/i/valid.svg
new file mode 100644
index 00000000000..aef9ff69edd
--- /dev/null
+++ b/pix/i/valid.svg
@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Generator: Adobe Illustrator 15.1.0, SVG Export Plug-In  -->
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd" [
+	<!ENTITY ns_flows "http://ns.adobe.com/Flows/1.0/">
+]>
+<svg version="1.1"
+	 xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:a="http://ns.adobe.com/AdobeSVGViewerExtensions/3.0/"
+	 x="0px" y="0px" width="16px" height="16px" viewBox="-0.1 0 16 16" style="overflow:visible;enable-background:new -0.1 0 16 16;"
+	 xml:space="preserve">
+<defs>
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+<path style="fill:#99CC33;" d="M6.4,11.1c-2-2.5-3.7-4-3.7-4S0.3,9.5,0,9.8C5,13.1,8.1,16,8.1,16s0.2-0.7,0.6-1.8
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+</svg>