hey, I read your blogpost a few weeks ago and started writing simple painting programm that allows for 2-dimensional palettes. it's still pretty basic, lots of general functionality is missing but I have reached a point where I am comfortable releasing an early build and get feedback what functions would be essential to implement.

so, anyway, here it is:
http://www.mediafire.com/download/kj7s0a2oysxbanu/Editor.zip

press 1 to export the image and press 2 to save the indices.

Spoiler