Thanks for the info -- I was looking for this feature, and couldn't find it. I'm using the would-be foreground color (per screen cell) as the "material" (in effect, the background) and the extended color mode to choose one accent color per cell. Most of the accents are generic, but many are material specific, and any given display is going to see lots of cell-to-cell material and accent changes. Using the tile editor to get this functionality is working, but a 1x1 tile option would let me pull off what I'm actually trying to do.