For my regular cab my wife took a box about the size of a shoebox (in fact it might have been a shoebox) and covered the outside and inside with some kind of decorating tape to strengthen it, keep it from wearing out, and make it look better. It goes right behind the middle of the seat and fits perfectly back there. I carry a number of things in it. Then I shopped around looking at the various styles and brands of organizers that have a strap that goes over the top of the seat and the organizer hangs behind the seat and has a number of pockets. I bought the style and size I liked best. Its really handy and you can store quite a bit of stuff in it. Since my truck doors don't have a pocket, I bought plastic door pockets from J.C. Whitney. They just screw on and come in 4 colors, one of which is the same gray as my interior.
Bright Red 2003 Edge Plus, 3.0 liter, reg. cab, 4WD, manual trans., 4.10 rear end.
Mods: Speedliner spray-on bed liner. Air box mod. K&N drop in air filter. Gibson Sweptside single pipe catback system. James Duff traction bars (above the springs type). Delta Industries black polyethelene truck box (mounted on the driver's side of the pickup box between wheel well and cab). Hidden Hitch receiver hitch. Side window visors. Door pockets.