The fun things I have been playing with lately are the Junkitz foam stamps. I like those because I can use the dabbers on them and they are easy to clean.
Here is the link to the Junkitz site. In case the link doesn't work. Go go junkitz.com and then to their online catalog. I got mine from acherryontop.com. I first tried them out during a class at this year's CHA. My postcards below have some of the foam stamps in the background. I really like the zigzag, lines, sunflower, paisley, dots, and diamonds.
My son also loves to use them with the dabbers. The only problem is that he does not want to clean the stamps.