Hooked up some lights to my bed rack this weekend... regular walmart type fog lights but i swapped in some LED bulbs. Each bulb has 5 x 1W LED's on them so they are nice and bright.
Also lined my bed rails with an LED strip all the way around. This turned out great and will be very helpful since I always have my tonneau cover down and it's impossible to see to the back of the bed if its even a little dark out.
And some toggle switches to make it all work.