This is fun and simple… Gather your supplies:
watercolor paper, brush, paint, palette, water, and some random sized bottle tops.
Dip the top into paint,
then press a tin into the page. Twist it a bit if necessary. Using water on the paintbrush, draw the paint out into the middle of the circle.
Repeat, using different sized lids, and different colors, overlapping some.
It doesn’t need to be great art to be worthwhile. It is enough for it to be relaxing.