I stocked up on the 4" x 10" Gusset bags last time they were on the clearance rack, because I love to make treat holders with them. This is one of my favorites, because it's so easy. The base piece of card stock is 4" x 10". Scored at 4" and 6". Decorate the front and back to you liking!
I used a bunch of retired colors, stamps, and papers for these - you can obviously replace with any theme you'd like.