I think gift cards are the way to go when it comes to birthday's and some holidays! It just makes sense to create cards that will hold the gift card, too. So much cuter than just putting it in the card!
I created this 5x7 card using Imaginisce's Summer Cool line of papers. The ice cream cone was cut from Cricut's Indie Art cartridge and the "Happy Birthday" from the Celebrations cartridge. My girls loved this one and loved that it will hold the gift card, too. Really, you could place all kinds of goodies on the front; money, an invite, concert tickets, itunes card... whatever you like!