If you're using dumbbells (for bicep curls), add a couple simple exercises to hit some other muscle groups. Do standing dumbbell flys (weights together in front at waist, raise to shoulder level while keeping elbows slightly bent) -- that'll get your shoulders. Do standing or seated dumbbell presses (weights at shoulders like you're doing a pullup, press up) -- shoulders again. Try one-armed dumbbell rows (knee and same side hand on bench, other foot on floor, other hand with weight extended to floor parallel to body, pull weight up to chest) for some back work. Also, do some tricep extensions (hold weight behind your head, elbow bent, extend arm and weight over head).
You can get some great exercise with a set of dumbbells in very little time. Good luck!