Experimenting with some “larger” tiles — i.e., making 32×32 blocks instead of just 16×16. It gives you more room to fit in details and looks a little less monotonous. This is inspired by the “fat” tiles used in Joakim Sandberg‘s work.
I also tracked down a bug that was causing the editor to very rarely get stuck in a mode where you couldn’t use Undo or Redo. It only occurred when you moved a tile selection, but dropped it exactly back where it was originally. The code was doing a return without popping a level off the undo-tracking stack.