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I'm a huge fan of the spiral pattern.
you lay the garment on a flat smooth surface, smooth out all the wrinkles, then make a small pleat right across where you want the center to be. Grab the very center of that pleat with a clothes pin, and begin to twist. As you twist, pleats appear farther and farther away from the center.
If you want it straight up random, just take a few rubber bands and twist and clump and get creative with it, just make sure it stays put.
You can use dye's that you put in a bucket and dip the shirt into, or you can do a different route and use little bottles that you can squeeje (im not sure thats a word) into it.
Good luck, get creative!