I had the hardest time coming up with an efficient way to store my cardstock scraps that didn't cost a ton of money. I finally came up with a solution by accident. A while back I bought the wrong kind of page protector refills for an album. I didn't realize until after I had opened them, so it wasn't possible to return them to the store. I kept trying to think of something to use them, and then I came up with putting my cardstock scraps in them, and filing them in a vertical scrapbook storage container. The page protectors are clear, which makes it really easy to see and pick out the color and size scrap I need. I'm using a lot less whole cardstock now for matting and cards, and a lot more scraps! I had my scraps stored in a large container with all of the colors together. It only took a few minutes to sort them all by colors and slide them into the page protectors. The page protectors keep them straight and unwrinkled as well, which was always a problem when I stored them in the container before. Especially when I had to dig through them to find the color I needed.
Feel free to share how you store your cardstock scraps in the comment section! I'd love to read about your solutions too.