The original tutorial made with envelopes is from Dawns Stamping Thoughts. It was linked to a cafe mom challenge. I will try to find it and relink it. Here is a tutorial of the extra simple one I made, just for you Jodi:)
Cut a piece of light weight card stock to 12" x 9 1/2"
Score at the half mark on each side. (12" side, score at 6")
Fold and punch inside where you will be inserting your cards.
tape the 9 1/2 " side opposite the punches with double sided tape. (thin strip. the cards will fit a little snug)
the end result is the double pocket card shown here. Then all you have left to do is decorate.
This will hold 5 1/2 x 4 1/4 size cards. Mine were thick so it will probably only hold my 2 but if you make them very simple you may be able to fit up to 4 in there:)
Hope it was simple enough and I hope I explained it well enough. Thanks for the interest!:)