Here's part two of the Halloween costume for my two and a half year old nephew, with my Mark II blaster.
It started with a kids belt from a thrift store. I used craft foam for all the "leather" parts and paper brads for the rivets/buttons. I cut and shaped the buckles out of 1/16" aluminum. The droid caller was made from pvc parts and more craft foam.
The blaster was my second attempt and came out a little nicer looking. It's made from a scrap piece of MDF, craft foam and a couple pieces of pvc fittings.