Basically my next two ideas are:
1. Berry bushes. They take forever to grow, but once they've grown, they'll give a constant supply of fresh berries.
2. Weed. This has been requested so many loving times I'm probably just going to give in. Rather than selling this to the government (makes sence, right?) it'll be only grown for it's effect. I'll probably make it screw with your fov, play random sounds only you can hear, make your timescale slower, things like that.
Also, tomarrow I hope to add many more lots. I never thought we'd fill up so fast!