Any good workouts for forearms?

I am currently a full time college student working a full time job, therefor I find it really hard to get to the gym. So right now im doing the 100 pushups program (basically just doing various sets up pushups on monday, wednesday, and friday nights before bed).. This program is really working my abs and triceps well, but in the meantime (Tuesday & Thursday) I would like to work my forearms as well.. So does anyone have any good workouts I can do at home to build muscle in my forearm??

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Body buidlingWorkout tranformation Bicep and Tricep routine