I so get the feeling of a warm summer breeze when I look at this background! Such a simple design (you know, I am a CAS-lover!), the crisp colors do all the work:
The sentiment is in Norwegian, and means Congratulations. Birthday cards are always good to have on hand, so when I'm making cards for no good reason (!) I often stamp birthday sentiments. Come to think of it, this design must be perfect for mass production, a gift-set for instance, don't you think?