This is a Valentine boxy bag that was a make-n-take at my recent gathering. (I added a couple of extra folds in it.)
Stamps: CTMH Heart Attack (retired), Playful Petals (words)
Here is a link to the boxy bag tutorial - http://confessionsofaribbonaddict.blogspot.com/2008/08/boxy-bag-directions.html
Please note that I added 2 more score lines on the long sides.