Free icon base: cantering by BronzeHalo on DeviantArt (original) (raw)
Update: aah, this is very old now! Lots of anatomy and movement errors.
Here is a newer, better version if you prefer it:
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In PSD format for editing: [link]
A tutorial showing how I made it:
And an example of a coloured version:
Base by me, please give credit in some way if you use it anywhere.
Have fun customising!