#NESdev progress report:
Yay, I can quickly switch palettes now in #tilerswift.
I had to rethink my approach and create a single widget instead of one widget per tile, but it wasn't so bad in the end.
http://inversethought.com/hg/tilerswift/file/tip/tilerswift#l65
Next up is going to be the tile selector, so I can build complete sprites out of tiles.