Are you really that bored with your workouts?
Not a great way to look at it. Trial and error is the way to find new and sometimes unconventional exercises that are really outstanding in hitting specific areas as opposed to just going by what a book says to do.
It's good to try any exercise that allows facing in either direction as the feel will be different-pushdowns, dip machine, lat pulldowns, standing calf machine, etc.
I'd say try the behind the back pushdowns with different grips and see what's comfortable and works-variations should all be tried. For example:
-Starting with a neutral, palms facing one another lat pulldown bar or rope attachment.
-Elbows out wide vs. by your sides.
-1/2-2/3 rom avoiding the top vs. full ROM.
-Stand directly under the cable vs. standing a foot or more away from it in either direction.