I found this really fun idea the other day to make themed boxes of stuff for kids the play with and explore. I'm going to try and do a different one each month. Here is one I want to try later on with colored rice.
{Share and Remember}: Rainbow Rice & Garden Sensory Play
And here is a great website with a bunch of ideas -
Counting Coconuts: Sensory Tubs
I had a ton of fun making my Halloween box. I ordered most of the stuff for it from the Oriental Trading Company. The Dollar Store would also be great.
Here is Elizabeth's box. It has a pipe cleaners (including a giant one), felt bats, buttons, spider rings, stickers and a flashlight.
and here is Alison's. No buttons or stickers in her box.