Professional woodworkers often don't use pads on their clamps because they know how to set them up without marring the wood. But if you prefer to use them for pipe or bar clamps, you can buy some or make up your own. Scrap rubber, shoe soles, even old mud flaps, can do the trick. For pipe clamps, cut out a slightly undersize circle to fit over the pipe using a sabersaw. Next, cut out the perimeter about 1/8 in. oversize. Then make a slit in the pad bottom so it can stretch over the pipe without taking off the jaw end.
As a final check when taping drywall joints, use a side light to check for smoothness. The light can be a halogen worklight, a troublelight, a lamp without a shade, even a larger flashlight. Hold the light close to the wall next to the joints in several places to reveal high and low spots, or bumps and depressions, that otherwise would be easily missed.