These photos of houseplants made of or augmented with common household goods made me laugh out loud — especially the moody, grey-background ones. I love them for their own sake, and as inspiration for a project for a rainy/snowy day..
PUTPUT is "an interdisciplinary Swiss/Danish artist duo... operating at the intersection where conceptual photography, styling, art, and design meet." They've created several fascinating photo series, but my favorites are definitely Inflorescence and Succulent. In these, cleaning brushes, shoe horns, pasta spoons, combs, and shower poufs are used to create remarkable houseplants. The results are understated and perfect.
Wouldn't this be a fun thing to do with kids (or without!) on a trapped-inside day? You could run around collecting objects that seem plant-like, then take turns inserting them into pots and/or existing plants. It would be especially fun to see how others react when they encounter the new "plants" — do they laugh, or not even notice?