I have seen envelopes like this using a heart so I thought I would do it with a butterfly! Then of course I had to make a card to go with it!
This uses the cottage wall DSP and the new Beautiful Wings embosslits die in the Mini Catalog. To make an envelope that will fit a 4 1/4" square card you need a 6 1/2" DSP. Then just fold the corners in to meet in the middle and put on your butterflies! Fold it closed like you would fold a cardboard box top.