There is a great new product line by Stampin' Up! called Photopolymer stamps. These stamp sets are completely clear. They adhere to your clear blocks wonderfully and are a fun addition to your collection.
Below is a new video released by SU! describing how you can use these sets. Enjoy!
There are currently 5 stamp sets available.
These sets are really cute and really versatile. I love the images they create, clean lines and dark images. They do come in a plastic package so you may want to order a set of the thin stamp cases to put them in.