I've been saving mine, just for kicks, over the last 10-15 years. The collection makes an interesting testament to the amount of roll film one has used. As such, they could make an interesting conversation piece, displayed in the appropriately sized glass container.

I've also wanted to use a few of them as "perm" rollers for a shoot with a model. Perhaps with a bottle of Rodinal as the perm solution. Only "the initiated" would recognize them for what they are.