I have had awesome size gains with fullbody routines. I like using three diff workouts with three diff rep ranges. Heres an example
Monday-big lifts!
Squat 4x8
Bench 4x8
OHP 4x8
Row 4x8
Google the 20 rep squat workout. That's what I used on Friday. Keep the working weights the same for each set and make sure you add 5 to 10 pounds everyweek. I got huge gains on this program but would not recommend more than 8 weeks of it.