I finally got around to organizing my stickers and my washi tape collection (which just keeps growing). I used the Staples Better Binder in the mini size, the Martha Stewart Secure-Top Sheet Protectors with full page, 1/2 page, and 1/4 page pockets (also available at Staples). I love the secure top because I know the items inside are secure!
My stickers are organized by category: Flowers, Animals, Travel, Holiday, and Misc. which I have labeled using Avery Label Tabs and my label maker. I put a plain white sheet of paper behind the stickers so that I could only see the stickers on the current page.
For my washi tape binder I have three categories: Masking, Washi, and Duct. The masking tapes fit right into the 1/4 pocket sheets. I also used the 1/4 pocket sheets for washi tape, I just wrapped the washi tape around the cards. I used a full pocket sheet for duct tape.
I love that I can just thumb through the pages and quickly see what I'm looking for. I'd love to hear how you organize your stickers and washi tape.