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RGBA - that sounds like a winner here. 4 bits per channel (RG and B), then 4 bits for transparency. I think that should yeild decent color results.

If that happens to be the case, I could probably whip up a program to convert a standard 24 bit RGB bitmap into a 12 bit RGB with a set transparency level or something to that affect - eg, take the 4 highest bits from each color channel, dropping the LSBs, and adding a common transparency level, settable from the command line ??

Source for the TGA converter would be most appreciated as well, as I'm sure it would prove helpful