The Hanging Gardens
I don't think this has been suggested yet. We played one game and while we had fun, there was little reason to lay a group of 4 or 5 motifs when the 3 group was getting constantly replenished. Why not do this: have only one tile on the board in the three group section, the normal two tiles in the four group section, and three tiles in the five group section? This makes assembling three motifs (especially when you just pick the three motivs in a row cards) less of no-brainer strategy as it will often not be a useful tile.
1 tile in the 3 group, 2 in the 4 group, 3 in the 5 group