I didn't come up with this project, I saw a picture of it but couldn't find instructions anywhere so I just made it myself.
I think it was originally called hardware store pumpkin or something similar.
I used 18 gauge wire, wire cutters, and round objects like a pen to form circles. I can't post pictures yet but here's a link to a page on my website that has a lot of pictures of the pumpkin and how I made it: http://www.my-homemade-decorations.com/halloween-decorating-ideas-wired-pumpkin.html
or you can look at just the pumpkin here: