I do! I keep all my cardstock in a filing cabinet, sorted in hanging folders by color family (you can see what that looks like HERE
. Scraps (1/4 sheet and smaller) are tucked into DVD sheet protectors (like you'd use to keep DVDs in a binder - do people do this any more?!) and those are easy to sort by color and tuck into the folders as well (HERE
is the green one, for an example).