Greg Ostroski showed us to to make this neat and very realistic ground cover.
First you need some firm foam that is an inch thick and you need to cube it so it's about 1" x 1". I noticed it kinda looked like cubed cheese at the Super Bowl Game party. Greg said that the size doesn't matter but it is easier to chop in the blender. See step two.
Step two. You need a blender. Make sure it is an old one because you will be adding paint. Load the blender up loosely. Put the lid on and turn the blender on low speed. While the blend is running the foam will start to climb the wall. You are going to have to push the foam back down to the blades with out hitting the blades. Greg used a dowel and he stated that if your dowel touches the blender blades you might get wood stuck in your foam.
Step 3 as you are pushing the foam pieces down, Greg added some water about 1/4 cup and turned the speed all the way up.
Step 4, when the foam is in tiny, fine, pieces, then you add the paint. About 1/4 of a 2 fl. oz bottle. Continue mixing, adding more foam or paint until you get the right color and texture you wish.
Step 5 Greg stated to spread the mixture onto cardboard or a sheet of paper. He also mentioned that you should NOT put a fan on to help speed up the drying. The foam will blow away.