One of my favourite stamping projects has always been creating coasters. Using Stayzon ink, you can stamp your main image on a tumbled tile marble piece (usually 4"x4")
, and colour in using one of a variety of ways. With the "Espress Yourself" set, I loved using the earth tones of Sharpies to colour them in, and that requires no baking or heat-setting of the tiles. A quick & easy gift idea is to make up a set of 4, wrap them in nice ribbon with a matching tag and you're done!
You can also use the Chalk petal pads for colouring -- just touch the ink to a piece of wax paper and use your blender pen to colour the images in. That method requires heat setting (15 min at 200F does the trick) for the colours to become permanent.