We've been doing lots of really informal preschool activities at our house with a Halloween twist. Here are a few of my 2 (almost 3) year old's favorites:
Spider Web Rubbings
You can read the how-to on this post. I made it a bit easier for a younger child by putting the web and the tracing paper on a clip board to keep it stabilized.
Yes, this one is still a huge hit. See how-to here.
Mr. Two loves tossing these little guys into our pumpkin trick or treat buckets.
Haunted House Math Bag Book
Still a bit hit. I laminated all of the pieces for extra durability. How-to is here (as well as some of my favorite Halloween stories).
I found a bunch of Halloween erasers on clearance last year. These are great for sorting, patterning, counting, matching and just throwing around the living room. That's how we roll...
And of course, lots of Halloween stories. We love a good not-so-scary book.