While I have created many SVGs for various projects, I use these as a reference.

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A variety of shapes that I use as a reference.
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An interactive demonstration of SVG paths.
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SVG Transformations

An SVG transformation cheatsheet.
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SVG Animation

A simple interactive SVG animation.
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Dynamic SVG Patterns

With a little Javascript, you can create complex images from simple shapes.
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A series of images which illustrate various chess moves.
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The classic playing card suits.
Random, daytime cityscape.
Random, nighttime cityscape.
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Various SVG backgrounds
trump einstein

Sean Brunnock