I love Dreaming Tree and make a lot of cards based on their high-quality patterns. If I want to use the same color scheme Leo is kind enough to include the American Crafts cardstock colors. I generally buy the variety packs so I ended up wasting a lot of time trying to find the colors needed for a given project.
I solved this issue by ordering the following 12″ x 15″ Shop Ticket Holders. 
I put each color in its own folder and label it with the color using an Avery label. I then sort them in alphabetical order stored in a bin that holds 12 x 12 paper. Works great!
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