Tie dye (hot water dye is the best because it won't run out)
T-shirt, handkerchief, shorts, etc.
Large metal pot
Take an article of clothing and gather it up into a bundle. Wrap rubber band around it tightly. Do this in numerous spots all over the article so that circles will turn up everywhere you want.
Boil some water in a large pot and when boiling tip dye in (sometimes you don't even need to use the whole pot of dye). Add article and stir for around 30 minutes over high heat.
When finished, take out with tongs and run under cold water to make sure all extra dye runs out.
Dry, then take off rubber bands. Iron and your piece is ready to use.
Note: Tie dyeing can be messy. Be sure to wear old clothes, and you may want to use rubber gloves.