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I wrote a library that lets you draw sprites using colors that aren't present in the level palette, runnable in the currently released version of JJ2+. It basically recreates much of the jjPIXELMAP, jjANIMFRAME, and jjDraw* code but with a special trick to get around the palette limitations. Even if you don't care about colors, if you're really not a python user, you might like that it reads graphics from .bmp files instead of custom .j2a files.

A sample script, beach2.j2as, is provided that makes the Fish enemies use the piranha sprites from Spelunky HD.

To use, write
in your script file and then use some portion of the API, which is all described in the opening comment of truecolor.asc. Alternatively, look through beach2.j2as and copy+paste mercilessly until you've got everything working.

Further updates may or may not occur, but I didn't feel this was ready for a J2O upload just yet.