Build folders with sample files

I've been working with a web application that uses an assortment of graphic file types. I've built a folder with at least a "one of each" file type the application works with. When I need a graphic file, I don't have to go scrambling to find the file of the type I want.

I keep the folder with my project work (on a backed up secure drive) but I also keep the sample graphic folder on a flash drive so that when I switch what computer I'm testing on (this happens frequently) it takes no effort to have my sample files on hand.