Although in the other pages here you have learned about
the use of a motor to spin a silicon wafer (or other flat object being
coated with some fluid), the same physical principles apply when it is
used to splatter paint onto T-shirts or paper or frisbees. See below:
People that I found who sell/rent spin-art machines and/or
supplies. Use these links to see what they are like and what typical prices
are. Then use the yellow pages for a party supplies store in your area.