Everyone gets a square with a quarter circle, this is the end result- could be a good ice breaker beginning of year activity. Each student decorates the square and includes their name. Nice way to decorate the bulletin boards in the beginning of the year!
Swipe art is good for older people with limited hand mobility. Put dots of paint on the paper or canvas then let the participant swipe with different tools: small heavy cardboard, sponge, flexible brush, the butt of a closed hand, etc.