This is the card I made for my sister on her graduation day. I used an airbrush with acrylic paint, mixed with water, in glass jars. (My smart husband helped me get set up like this). I also used commercial stencils. I think these were from The Crafter's Workshop. The word "CONGRATULATIONS" was created using rub on letters by American Crafts (Brady Font).
Note: This photo is of the card opened, so you are seeing the back (yellow and green) and the front (red and green) of the card.