I can think of a few. There was a technique I learned years ago called "Bleeding Tissue" or something similar. Basically, you put several pieces of colored tissue paper on top of a piece of glossy card stock, then mist them. Let them sit until almost dry, then remove the tissue. Makes easy, colorful backgrounds. One note: not all tissue will bleed. The one I used to buy that was guaranteed to bleed was the Spectrum brand from Michael's.
Another is the acetate and tissue. Tutorial on SCS is
HERE.
Faux Silk- SCS tutorial
HERE.
You could also use it to imitate stained glass by paper piecing.
This Faux Silver Leaf technique, I did
THIS tutorial for a company I used to be a DT member. Since they are going out of business, I'll probably need to do a new tute and put it on my blog.
You can also make really pretty tissue paper flowers. SCS tutorial
HERE.
I'm sure there are tons more, but that's what I came up w/ off the top of my head.
Hope this helps!
Julie