Here's our newest sensory bin.
The theme for this one is fall. I picked up the package of fabric leaves at Dollar Tree, and while they were initially pretty crunched up, a few minutes with the iron on on a low setting left them looking much better. The little plastic acorns and pumpkins also came from Dollar Tree. (I picked up several packages of each, and will additionally using them as math manipulatives this month.)
I added some Little People and Little People animals we already had, and there you go, a little farm in the fall.
The kids can search for the acorns and pumpkins, pretend to rain leaves down on the "farm," or just free play with it.