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.
'Children paint plexiglass and make an outdoor exhibit for them to walk through. Viachroma by Rowena Martinich: Pedestrians are enveloped in colored lights and shadows as sunlight passes throught at different times of day.
27 Ideas For Kids Artwork You Might Actually Want To Hang
Painted Treasure Rocks - A classic kids craft. Let your preschoolers, kindergarteners, or elementary children paint bright designs on rocks. Fun spring or summer activity. Give them away as gifts or decorate your garden!