The coloured background was made by applying Distress Inks to an acrylic block, spritzing, stamping, re-inking, etc. The happy birthday sentiment is from STAMPlorations, and all the other grunge marks are one stamp from Magenta.
So come and join us. If you don't want to use washi tape you can still play along with any birthday project.
I'm entering my card into Simon Says Monday Challenge, Anything Goes.