These are the stamped loot bags I made for my son's Birthday this week.
You can get a package of 50 cellos bags from Stampin' UP for $5.95. I then used white stazon ink and black stazon ink (perfect for stamping on plastic) to stamp cupakes and balloons from the "Crazy for Cupcakes" set on the bags. The images are hard to see in the photo (click on the photo to see it larger), but they were super cute and nicer and cost less than anything you'd buy in a store.
Why not add a package of cello bags to your next order?