Terrain is crucial for any game, but I find that I am always neglecting terrain in favour of figures or vehicles. So to work a bit on this deficiency, I've added a small olive grove to my collection.
I was inspired by Pat Smith's Setting the Scene: Volume II – Creating a Wargames Layout for the Mediterranean. Great book, highly recommended.
I started with some old CDs, added some air-dry clay, sand and ballast for texture and some tree armatures from Woodland Scenics. I experimented a bit - I put four trees on the first base, which looked too crowded. The one with only two trees looked a bit sparse, so I put three trees on the remaining bases. Once I added the foliage, though, the bases were pretty full, so two trees per base is probably right.
All five bases:
The two-tree base:
The four-tree base: