I found this cute and easy to cut and make treat bag at www.prettypapergraphics.com. A little bit of inking was all it needed and making 10 didn't take a ton of time once I was able to sit at the table and begin.
I used AC and Bazzil cardstock for the cuts. All pieces were cut with the eclips2 and eCal3 software.
Ink, blending tool and pads (Tim Holtz/Ranger)
A bit of glue (lineco) in my Baby Bot glue bottle (no squeezing necessary!)
Cello bags (Dollar Store find)
Assembly is very easy as the box is one piece. I suggest inking all of the pieces before assembly. Glue the eye pieces together and set aside. Glue the stem and add the leaf and curly cue. Add the eyes. I didn't put anything on the back, but it might be fun to add a little personalized note on the box before putting the box together.
I applied a line of glue to the tabs that would be glued to the back of the front. Use your finger to make sure you have a good bond. Repeat with the remaining tabs. Add the handle. I might add a second cut of the handle for thinner weight paper. 10 of these boxes put together in less than an hour... not bad!
Fill a cello bag with a favorite treat - a cookie or brownie would also be a good fit... not quite deep enough for a cupcake.