Here is a quick post for today of a card I made for my niece's 12th birthday. I used the Birthday Block stamp from Stampendous that I just LOVE! It is so versatile, you can make it look different every time you use it. I used pink, lime and teal Chameleon pens to color all the the "12" I could find and then picked some to the other fun images to color. It was then layered onto a lime green panel and mounted onto a pink card. I didn't add any ribbon or 3D items since it was going in the mail.
For other variations you could stamp the image twice and cut out the balloons, cake, present and anything else you would like to color and pop up on the other stamped piece.