So to begin I'm building my first ever diorama (1:72 scale) and I'm no pro but I'm enjoying the process. this morning I had a wild idea to make my grass more realistic. My diorama is based on a ww2 country side air field. The idea is mole hills and I was wondering if anyone has had experience making mole hills for there dioramas. What size would I need to make them and what would be the best material to use.