First, I label each folder with a Brother labelmaker -- black on clear. I make up sample blocks of each folder on white papers. I have a loose-leaf binder with clear page protectors. Each page protector has a dark colored full-page sheet> I insert 4 sample papers on each side of the colored sheet for a total of 8 samples to each page protector. Then I store the folders inside a clear plastic shoebox, in 2 side-by-side piles.