What can I use that I haven't already to spice up masturbation?

I've got a cock sleeve, pump and a few basic cock rings.

Wondering what else is out there to use on my cock or balls like ball splitters or kink stuff and stuff like that?

I use a vibrating cock ring and a butt plug.

Bought my first and only cock ring this past February... "The Tugger" from Adam & Eve... check it out as it is absolutely awesome.

2 rings, a larger one for balls, and a second for base of penis molded into one piece. When you stroke upwards, your balls are pulled (gently!!!) out and up; stroke down and they return to the lower, but forward protrusion position...and never can pull up. VERY intense.

ever try estim

I have thought about e stim, how is it?

two water balloons filled with hot water and pretend they are boobs and tit fuck them

Try a ball stretcher. It looks and feels really kinky and it increases my cum load. If you're really kinky and daring you could also try penis plugs and sounds. Once you're used to it, it feels so good to have your cock stimulated from the inside.

i like to play with ice cubes

Not for the faint of heart but check out sounding and urethral play.

I love my spark plug by oxballs. It's an ass lock with a ball stretcher and cock ring. You can jerk off and feel like your getting fucked at the same time.