I'm running a Domination Event this Saturday at Hobbytown USA in New Berlin, Wisconsin. For that, we needed to make two 6" x 15" mountains and 6 50mm diameter boulders per table. I've limited the event to 6 tables because I don't have enough insulation foam to make more mountains or boulders (plus my hands hurt from cutting it all).
Here's some WIP pictures of the mountains, being painted by my FLGS owner because he likes to work on terrain.
Not all of my boulders are the same size on the base, I figured a little variance would make them look better.