This great "gift card" holder is actually two large envelopes (4 3/4 x 6 1/2) attached at the tops. One flap is glued inside the other flap to hindge like a book.  I used Lovely Lilac cardstock to line the envelopes (just enough for where it shows) to cover the fact that they are envelopes. You can buy the mini 3×3 envelopes in packages of 40 now, which I LOVE–I can make 3×3 cards from any color I want.  Now, for my big wish–getting the "mini" envelopes (3 x 4 1/4) alone… again, I like to cut my mini cards from scraps of colored paper.  I do use the mini notecards, but mostly on a cardfront! The set featured is Blossoms Abound (more samples here). The color combination is Lovely Lilac & Almost Amethyst.  I used sponging and also repetition of the detail lilac on the background for effect. The "hinges" are the Word Window punch and mini gold brads.  This was part of a "With One Set" class that I did this summer.