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Most people just attach egg crate to a mag float though there is a guy over on MR who makes some really cool racks. I can't attest to whether or not they stay attached to the glass.
Egg Crate, Frag Glue, wire cutters and imagination. Hangers can be made also from the egg crate that hook over the tank lip so the racks are not permanent. Heres two examples. first is a 12 gal with a double hanging rack hanging off the back of the tank and 1 rack on the bottom. The second example is a 29 gal with a hanging rack on the back wall extending out on both sides.