I work my triceps more or less like I work everything else. One "major" exercise where I keep trying to increase the weight week over week, and one "accessory" exercise where the weight will often remain pretty static for a longer period of time and I use more reps to get to failure if I need to. In this case I do 4 sets of braincrushers for 8-10 reps supersetted with close grip presses using the same Olympic bar immediately after each set of braincrushers.
I dunno why I fixated on that, but it seems to work well. The important thing to that one is that I keep trying to push the weight higher every week. Eventually I'll notice my form suffering significantly and I'll have to back off a bit and add a few reps, but I always try to work it back up every week until I'm tackling the problem weight again. I believe that increasing the weight consistently is probably the best way to continually stimulate growth. I was up to 120lbs on those on my last triceps day, but it may soon be time to back off a bit again.
The "accessory" exercise I use is simple lying dumbell extensions, usually 3 sets of 8-12 depending on how much the braincrushers/close grip presses got to me. I did recently increase the weight on those to 45lb dumbells, so I'm not getting as many reps as I used to, but 40 was getting to be a bit easy.
My triceps workouts are generally really short, but I think I've distilled them down to what works without the eleventy million sets, reps, and exercises you see so many people doing for both them and biceps in the gym.