This is a simple mod that gives a nice clean look.

If your car was born after 1967, chances are it has fender and quarter panel mounted turn signals. My '68 Camaro had four rather bulky turn signals that didn't do much for the look of the car so when I did all my body work, I decided to remove them.

The first step is to remove the lights and remove the paint from the surrounding area. Make a template out of cardboard (non-corrugated) and trace the shape onto a piece of sheet metal that is about as thick as the car's panel. The easiest way to match the shape is to do a rough cut with a band saw then finish the edges to the mark with a pneumatic grinder. Once the form is made, tack it on with a welder.

This brings us to choosing a welder. In a perfect world, the metal would be clean on both sides and it would be off the car and on a bench, but that's not always possible. If you can get to the inside of the panel to clean the paint and/or undercoating off, I recommend using a TIG welder because it's less brittle of a weld than MIG and can be hammered into shape. TIG welding is more sensitive to contamination so if you absolutely can't get to the backside of the metal to clean it, MIG welding will work better. 

In the example pictured, I used a MIG welder. With both welding types, its critical to keep the head levels down so only weld a little bit at a time and don't start again until its cool enough to touch.

Once you are done welding, grind down the weld with the same heat range in mind. Grinding can turn metal blue just like welding can so take breaks to let the metal cool and keep it warp free.

The last step is filler and paint, stay tuned!