I like mastrubating in the shower with one of those pulsating massage showerheads, but sometimes I want something to wake me up in the morning! So I freeze one of those popsicle molds with water. (Don't use a sweet popsicle, you could get a yeast infection or something. I don't put a popsicle stick in, obviously.) It's a little too cold for my clit or my pussy, but I love shoving it up my ass. I can feel it moving inside me because it's so cold, and then I use the hot showerhead on my clit. But sometimes my ice dildo slides all the way into my ass and I have to wait for it to melt out. Chilly!
I also take the caps off of empty mini shampoo bottles, squeeze them hard and stick them to my nipples or clit. The suction feels so good. A soft bristled scrub brush is also great on nipples and clit. A little fun in the shower keeps me awake for those morning classes!