I just finished my warmup entry.  I tried to make minigames with achievements, though I spent a lot of time improving my sprite generator and experimenting with graphic filtering batch processing. The sprites in this game were scaled using Inkscape filters called from a batch file.

Conclusion 1: my graphics tools still have some issues, but I’ll make do with what I have.
Conclusion 2: I really like making minigames!

http://www.ludumdare.com/compo/ludum-dare-26-warmup/?action=preview&uid=14520

The random sprite generator can now generate tiles too! Check it out here:

http://tmtg.net/ludumdare/spritegen/