At CHA this past January, I introduced our spring clear stamp sets. They have been wildly well-recieved and I have designed a few demos and classes around several of them. One of my favorites is the set we call Spring Blooms. I have a bunch of these sets that are designed around some wood mounted stamps I designed in my Cardmaker's Collection line of stamps. They are primarily solid reverse square stamps (where the design is actually white and the black square is what takes the ink). When you stamp them, the flower for example, the image is blank paper and the background is where the color is. They lend themselves to stamping with rainbow pads or coloring on them with markers and spritzing them.
My favorite technique is to use Cut 'n' Dry Felt from Ranger and cut it up into little pieces. I put these into little plastic boxes and make my own custom blended ink pad with them using dye-based reinkers. I love love love this look.
These sets in general offer a lot of possibilities to the stamper as they have these reverse blocks but they also include several word stamps and several background stamps to coordinate with the solid blocks. Check out the newest entries in the Cardmaker's Collection section for some samples!