I use a parts organizer for my standard length pens, a brush pen marker tray for my long brush markers, and I store my basic, currently-in-use stationery tools (cutters, adhesives, erasers, white out, rulers, etc.) in a pouch. Refills & backstock go in a desk drawer in a series of interlocking, clear acrylic drawer organizer trays. You can get parts organizers in a bunch of different sizes--Arteza even has a new one that would hold a lot of pens if you sorted just by color alone.