A picture scavenger hunt!
Give the kids a digital picture-taking apparatus and a list of 20 (or more) things for them to find inside their home or play space. The game's not finished until they've taken pictures of all the items on the list!
Mine included things like:
Something made out of real wood.
The letter "O".
And, pictured here, a bottle.
(I was pretty impressed with the quality of this particular shot,)
You might be surprised by what they find!
Or, you can insist that they create everything on the list:
Build a castle.
Make a footprint.
Cut out a paper star.
Make a rainbow. (One idea is pictured here, courtesy of my kid.)
So, start your list for your rainy-day picture scavenger hunt, and have some indoor fun!