If your kiddo is learning their colors you can go on a color hunt around the house. Yep it's that simple but if you big it up it will be super fun! You can even do some prep work by making binoculars out of toilet rolls first (decorate two toilet rolls, tape or glue them together and then attach yarn or such like and hang them around your neck). Be sure to make your own pair too!
Once your kiddo has picked a color, head off hunting... take photos along the way and then once you are done you can look back at all the things you found in your chosen color. Your kiddo will get a kick out of helping to take the photos.
Older kids will enjoy this also and they can take it further by putting the objects in order from darkest to lightest or writing a list of what they found etc.