Easy to make spiders and bats crafts.
Foam craft sheets
Just cut out spiders and bats shapes out of the foam sheets and add eyes.
I just freehanded these, but you could make a pattern if you make several and want them to all be alike. On the bat I used cut out circles of another foam sheet for the eyes.
These spiders and bats can be used to decorate a school bulletin board, windows, or you can attach a piece of fishing line to hang from the ceiling or to make a mobile.