I also have two shelves full of terrain, all modular for different board configurations. I took several pieces of green felt and stapled it to the plywood to cover the wood and give a nice surface to play on. It doesn't hurt that it looks like grass too!
Game Table Folded up:
Side view with the latches on:
And my table unfolded:
And finally, my ever growing terrain shelf:
So, there it is. My table of awesome is, well, awesome. Already got four games in on it too, and it hasn't even been there for 2 days. Nice thing is, when I am running the campaign in my house, we can split the table into two 4x4 pieces and run two games at once, that way we can get them all over in a night.