There is the greatest idea and tutorial at Operation Write Home.
I needed a birthday card for one of my grandsons who loves Legos, so this tutorial was very timely. Here is my take.
Simon Says Stamp and Show - one stamp
Created With Love - red and yellow birthday
CASual Fridays - polka dots
Sister Act - anything
Pink Gem - spots
House of Gilli - bright colors
Great Impressions - anything