The art museums may be closed, but you can have your own Home Art Museum!
Don't worry if you can't make it to the craft stores (before they close). There are so many crafts that can be done with natural and household objects.
So go on a hike and look for interesting natural items to make into your own art masterpieces. After each child/family member creates their pieces, set up an art gallery in the living room!
When my kiddos were little I always had nature objects on hand that we gathered from our outdoor adventures. On rainy days, we would bring out all those items along with glue, strings, and paints and have great fun. I can remember one particularly gloomy weekend pretending to drive to our Home 'Art Museum' by forming a 'conga/train' line and weaving all through the house on our way to the 'Art Museum'. Make the best of it!
Here are some links to nature craft pages to help you be creative: