You have two options for the spiders body - ritz crackers or vanilla wafers. Either is yummy. Make a mixture of both!
round crackers or the vanilla wafers
small chocolate chips.
Spread the peanut butter on a cracker or cookie, then in the peanut butter you can either arrange 8 pretzel stick or break 4 into 8. Depends on the length you want legs. Once you have 4 on each side, take another cookie or cracker, spread some more peanut butter and put it on top. Then to add the chocolate chips as eyes! Use a little peanut put on the bottom of chocolate chip and place on the spider body. And wa-la! You've got a yummy spider to eat!