Colorful Birthday

I saw a card similar to this on Splitcoaststampers.com but it was a pink monochromatic and I think birthday cards need to be fun and colorful. I made a few at once to include in my family reunion auction donation, but I should have made one first as a test run. I would have made the cake piece much smaller and I think it still needs something else, but can't think of anything. Any ideas?