A while later I was making a prop sword and cutting foam with a jackknife, which is a great way to cut foam except that you have to use up a magazine or empty tissue box (and that's good material for other DIY projects) or something so that the knife doesn't scratch the floor. When my tissue box cardboard just wasn't cutting it (pun intended) anymore, I wanted something more permanent to use as a cutting board, and gift cards seemed like just the thing.
It probably took like two minutes to complete, and it turns out it actually folds up (well, part way) too. I'm certainly satisfied with the results. It's so easy that I'm not even adding steps, I'm just explaining it here. Keep in mind, though: you can't use the cutting board to cook. It's for use in DIY projects.
A number of gift cards with two factors that are close together - I used twelve
Ruler or straight edge (optional)
Arrange your cards into the form you want them to be in when you're done. Using a straight edge helps keep the cards perfectly aligned so that the cutting board will fold better later. Tape the cards together in that form. That's all you have to do. You can see how to fold it in the pictures.
That was a rather simple project, but I'm sure there are other uses for gift cards, and other ways to make cutting boards that are more interesting. Do you have one? Post it in the comments!