So here were the two designs I came up with. I liked them both, but I think I decided I liked the top card the best. My favorite part of the card below was the swirly stamp in the corner....although in retrospect, I don't really think it goes all that well with the birthday set...but anyway, I'll use it on another card!
Colors: Tangerine Tango, Chocolate Chip, Whisper White, Old Olive, Bashful Blue
Stamps: Party Hearty, Stitched Exotics
Accessories: 1/4" Old Olive grosgrain ribbon, blue glitter, corner rounder, 1/2", 3/4", 1 3/4" circle punches, large dot texture plate for Big Shot