<img src="http://www.ludumdare.com/compo/wp-content/uploads/2013/04/Screenshot-spritegen1_0-crop.png" border="0">
I found this by chance. This app generates 12x12 size sprites, and you can save it as a strip. I think this could be helpful for C2 users. Cheers!
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very cool, thanks for the link!