I have lots of customers that do this. It saves them lots of space!! Here is how they do it:
"I use something called Aileen's Tack It Over (you can pick it up at Michaels for like $2)...and I put it on the back of the cut SU stamps once I cut them to size..then instead of mounting on wood blocks, I can store them in an acrylic CD case. When I want to use them, I can use my acrylic blocks and just stick them to that..this way, I can see exactly where I place them

Also it takes up less room for storage than the wood blocks."