Do your clear mount images slide around in the case? Are you worried you are missing one? I saw this solution at the regional seminar, and have started doing it myself. SImply keep the extra rubber that the stamps come with.
The set shown is called Something to Celebrate, a level 2 hostess set shown in the Occasions Mini catalog. I like how it keeps the images so I can see all the words!
I do this myself, but I peel the adhesive off the back of the rubber and put it the rubber side up. It works great to keep all the pieces neatly in the case, and I always know when a stamp is missing.