tape with stuff under the tape to make it look like tape over rust. Some PVC tubing held on with pipe clamps, not hose clamps but the u-bolt style pipe clamps to make it look like the frame broke and you bandaided it back together. Stick on a couple of actual bandaids to add to the effect. Throw on a rear rack but make it look like it is about to fall off somehow, loose bolts with the nuts help on with locktite but spaced out a bit. Add some rattle pieces and some old loose metal fenders to make it sound like a horse and carriage with bells on clanging its way down the road. A broken headlight dangling with bailing wire can help too.