The Wargames Table blog has a good idea for filling in the blank spots on a movement tray.
movement tray
Making Flocked Magnetic Unit Stands
The WAB Corner Blog has a nice post on making terrained magnetic bases to hold four figures based individually on washers.
Making Magnetic Movement Trays
Mitch’s Wargaming site has a neat design for magnetic movement trays. I like the irregular shapes.
Making Group Movement Bases
Here’s a illustration of how to make some very nice looking group movement bases.
Making Plasticard Movement Trays
The Tabletop Terrain site has a little, but useful article on making movement trays for your figures. This is particularly useful for games like Warhammer Ancients and the new Lord of the Rings big battle game, where large numbers of individual figures are maneuvered about.