I keep all full sheets (I only use 8.5x11" sheets), because I never know what size card I'm gonna do. Unless, of course, I'm buying the supplies for a specific project (christmas cards, invitations, etc). Then, I'll cut it down once I get the supplies, even before I start the project.
I keep all of my cardstock in a milk crate, in hanging file folders. I had it in magazine boxes on my bookshelf, but they kind of fell apart after a few years (they were cheap, really cheap). So now I just use the hanging folders in the milk crate. It works right now, but I'm going to look for another solution after the new year, when I can actually clean out what I have, and bring the rest of my stuff out here to my apartment (at least 35% of my craft supplies are still at my parents' house back home, I only brought the most frequently used things because I didn't have much space in my old apartment), since I have more room now.
hi my name is ashley, and i am a self proclaimed "craft queen"