I know bodypart splits in general aren't vogue here, but this leg day was one of my best as far as gaining size. Looking for something new, give this one a try. 1 x week, preferably on a Monday when the rest of the pukes are blasting their chest and biceps for the first of 3 weekly sessions.
Machine Hack Squats
Warm up nice and good first. Might want to even do extensions if they help you warm up or ride the bike for a bit. Get the legs warmed up and work up to 3 sets of 12-15 reps.
Leg Curls. I like these in the 20 rep range. 3 working sets
Squats. Now you are nice and ready to squat. Form is key. Deeper is better. 3 sets of 12.
Stiff legs. You should be shaking and ready to puke by now. 3 set again. 12 reps as well.
Walking lunges. I liked using dumbbells. Find a long space and go as far as you can for two trips.
Now, this isn't the be all/ end all of programs. Obviously one needs to set up some type of progression scheme they can work in and also account for de-loading or backing off periods. I usually did calves after an upperbody day because by the time I was done I couldn't walk for awhile and needed just to sit down. If you want something different, give it a try. Sure, one can point out there are better options, and there are, but this worked well for me. Other variables surely played a role.