Here's a quickie (sorta) tutorial for a giftcard holder and coordinating envelope. The finished size of the giftcard holder is 4x4, but I got the math wrong on the envelope and it's not a perfect square. Naturally, I got the math wrong.** LOL It still looks sharp.
If you have any questions, feel free to address them in the comments or email me at the address in my sidebar. Click to view full-size photos.
**cut this at 5-1/2 x 10 for a 4-1/2 square envelope