Here's a fun one for biceps. they're called "21's" among other things.
basically its bicep curls, but for the first 7 reps, you only raise them to the halfway point then lower. a half rep. then the second 7 reps, you do the top half of the rep only.
for the final 7 reps, you do the entire range of motion..normal curls basically.
you do all of these as a 21 rep set, hence the name.
I do recommend dropping your weight by 10-20% when you do these, and really squeeze the first 14 reps out. You'll be lucky to do the last 7 full reps without cheating.