OK, This project is pretty much done. The paint was done last night and there were pretty much 3 steps to the process.
First I mixed up some green, tan, black, white acrylic paints with a lot of water to be kind of a dirty gray wash and liberally applied it on the matte black foam coat. While it was still wet I made a similar mixture but with a heavier green hue and gobbed that on top to let little puddles form and have the two colors mingle to form an organic, marble-esque effect.
When that started to dry I padded it with a rag and then started dry brushed on a thicker gray paint on the high points, being careful not to make it look tpo uniform or cover up too much of the colors from step 1.
Step 3 was to add some "veins" of white and brown color. For the brown I dry brushed on some Tan colored Tandy leather gel stain and then wiped it off with a rag. To get the speckled white effect I poured on some crushed red pepper and then lightly dusted the surface with some white spray paint. I immediately removed the pepper flakes and it left me with the desired specks.
My final step was going to be to do a coat of glossy clear coat followed by a coat of flat clear coat to give it a kind of shimmery, cave-stone effect BUT I overestimated how much the thick foam coat actually sealed the foam. As soon as I sprayed the first bit of clear coat the foam started melting in parts (DAMMIT!). After patching up the fried parts, it still looks decent, I lost a little bit of the subtlety I had before but It doesn't look too bad. It was a good exercise in foam cutting and it was my first time using foam coat as opposed to just latex paint. Thanks for reading!
