Movement trays are very handy in a lot of games. But care has to be taken that the visual look of the game does not suffer. I hate it when half-empty or dirty or ugly movement trays are being used.
For our last game, I quickly made some standard bases with small scenic features which can be used to "fill up the holes". As you can see below, I used some rocks, a small tree, some skulls, a rat, etc.
Place them between your figures in a movement tray, and the visual appeal suddenly goes up by a factor of 10!