I have used one of the thinner ones as a shim before but I wouldn't recomend it. I had filed it down in size and I shimmed about 3 padlocks with it before it broke.
hzatorsk wrote:I measure really thin gaps with them.
The other thing you could do with them is save 'em up and use them to make laminated handles for the picks you make. Also, as mentioned, they'll work for shims.