What about creating your own patterned background? It is so easy and fun to create! I stamped all of these cute critters and elements on a piece of watercolor paper (Versafine works very well with water). Then I looked for a few beautiful Distress Inks to color my elements. When you put several layers of water on each other, you'll get that messy watercolor look. I also splashed some waterdroplets on it plus some white ink splashes. A few lighter dots add more interest to your card! :)
Oh and I like to use black sentiments - specially on a colorful background! (there might be a comma missing between "birthday" and "awesome"... )
The stamp sets, which I used: Just Sentiments, Happy Hoppy, Lucky Duck, How are Ewe
I hope you like it! Have a great day!