I've seen this wonderful crafting tip at Sherry's blog. So, I've made this cardstock labels with all my embossing folders. It's very helpful when looking for the right folder for a new card creation. You take the whole bunch and you can lay several rectangles on you card (without taking them off the ring) and then decide what embossing folder matches best.
Please stop at Sherry's blog to get all the instructions about the crafting tip !