I didn't have a full set of blocks so I couldn't use their template, but I made my own cards to fits the colors/sizes that I did have and it was a HUGE success with our pre-school co-op. My 4 yr old loved playing with them for days after that pre-school lesson and his friends that have come over to play loved it as well.
These are printable magnet pages. You can find these at Making Learning Fun. She got colored puff balls and glued little magnet pieces on the back. These you can use on a small cookie sheet or a magnet board