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Jarrell, I would have to say that this rock thing is not really a funny post. Things are geting too serious here. You are going to end up with a reputation like Woody Allen when people ask him about the early "funny " films he made and why he doesn't make those kind of movies anymore....... As to the rock at hand. I think Selector has it right. There are lots of different prototype rocks out there and choosing the one you want will tell you a lot about how to make it. What you have made could be passable for the decomposing granite found in Joshua Tree CA if you were to color it correctly (the color you have now reminds me of... ..we're not even going to go there). I think the issue with foam will be getting a texture that is fine enough for most rock species. This could be accomplished by painting the rough shape with plaster or maybe a gesso type product to give a smoother surface. Another area for experimentation would be to get some fracture lines and striations in the rocks. I'm not sure how well the foam will be able to accompli***his.... Perhaps cutting thin pieces and stacking them up, sealing them and then painting with washes. On my last layout I hand carved plaster rocks. See my site in the signature. Took several years to complete the carving on a 4' X 16' layout using this method. I didn't work year round, but it was large project. One of the cool things about carving that you don't often see from rock molding techniques is that I was able to align my fracture lines into anticline and sincline formations (the fracture lines follow a consistent pattern through large areas of scenery). On the new layout I will most likely be using molds to make rocks....
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