Art riot has cheapy arty stuff to do.

Often with DD I just give her some glue and stuff to stick on paper and she loves it.
We go outside collect leaves, whatever stick them on
Go thru junk mail and let her pick out stuff to cut out and she sticks them on.

Paint, messy, but she loves
and simple coloring always seems to be enjoyed.

Also recycling stuff comes in handy we made a robot one day out of boxes and egg cartons and she used glitter pens to decorate.