The Children's Book Council has made available lots of coloring book pages from illustrators of picture books and comics. The 2020 theme was "Read, Dream, Share."
Since we're under social isolation, why not print some out and have your kids color them? Heck, you can color them, too. You can even download the full coloring book by scrolling to the bottom.
This is mine, made back in the winter when life was cozy and nice. (The downloadable version lost some line work, somehow, but it should still do.)