I actually cut my acetate box in half and created a stationery holder - envelopes on one side, cards on the other; or you could do each side with sets of cards and envelopes mixed together - either way would work. I used Lauri Schmidlin's tutorial and increased the overall measurements just a smidge to allow for a pen (held with the ribbon) and the width of the box 1" (so when cut in half, 2 inches together).
Accessories: misc. rub-on, recycled tissue paper - brown and aqua with sparkles in it, corner chomper, MME lush gems, MS butterfly punch in MME paper and vellu