Envision this if you can: Take two golf clubs and wire them securely along the top tube of your bike, with the club ends protruding behind the seat and over the wheel. Bind the two club ends together with duct tape. Then, take a moving dolly, the kind with one handle sticking out behind, and secure a thirty-gallon plastic garbage can to it with some combination of wire, duct tape, bolts, or whatever. Tip the handle into the space between the handles of the two golf clubs and secure with more wire and more duct tape. Result: Instant cargo trailer.
I just saw this get-up hooked to an old bike parked outside the grocery store and did a double-take. I don't think you'd want to take it touring, but it looked well-used and probably does fine for whatever the owner uses it for. You have to give the person major points for inventiveness and making-do.