I paired up that stamp set with To The Nines specialty paper to make this adorable card. It fits in a medium envelope (regular size for a 4-1/4" x 5-1/2" card) and is definitely a WOW for the recipient.
I used a 5 1/2" x 12" piece of Always Artichoke card stock, scored at 2", 4", 8" and 10". Then I cut 1-1/2" from each long side between the 2" and 10" score lines. Trust me, it's much easier than it sounds!
I used the Really Retro word stamp set for the front, and On Your Birthday for the words on the rest of the card. All of the other stamps are from the Under the Stars stamp set.
From there, it's just using whatever embellishments you want (jumbo eyelet, punched out stars adhered with dimensionals, mini library clip, corduroy button and brads).
I took a photo of the top of the card. You may have to fold it a couple of times to get it where it looks like this when the recipient opens it, but that just takes a minute.
I hope you'll try your hand at this kind of card and share what you come up with!