To create handmade treat boxes, I find the easiest way to make my project go quickly is to use manual or digital die cut shapes like this one shown below. Pick one that will fit the treat you intend to share (think depth, width and height).
(see link below to product)
Cut the shapes from seasonal scrapbooking paper for even more fun. Decorate the outside of the boxes with stickers, twine, enamel dots, and other die cut shapes. Who wouldn't want to receive a yummy treat with boxes this cute?
Here's another look at these boxes. You can alter this project by using Halloween, Christmas, or other seasonal paper. You can also use different shaped boxes so this project will fit best with what you have planned to share.