Had a good idea recently, I don't know how well it will work, but the idea is a SQL database that holds information on millions of items like bits of gravel, plants etc... Procedurally generated stuff is probably much more efficient and nicer, but I want my plants to grow!
Here's a screenie-
and on the game front, these new turrets are giving me jib. I hadn't counted on joining separate baddies together, so a bit of a rework is in order. I reckon the turrets are worth it though-