Origami is a little tricky for them because they don't have the dexterity, but with a little help they made origami bookmarks and christmas trees as an activity. They had fun with it. Folded Paper Heart Book Page Marker – DIY
Before and After - Old oak pedestal table painted and looking good! Her site has really good instructions on painting old furniture with the right materials so that the paint job lasts! I have this exact table.
Here's a little tutorial on how to make your own rubber stamps. I like to use a stamp carving block as this allows you more freedom with the size. It can also be nice to affix your stamp to a woodblock to make stamping easier.