Why not make a paper aeroplane? This encourages children to use their imagination and the folding technique improves concentration, spatial awareness and fine motor skills. You could draw windows and decorate it then try it out to discover how far it can fly!
A different take on a rainbow. Using any paper or material you might have, you could create a rainbow butterfly or use your imagination to produce your own rainbow artwork.
Why not have a wee shopping spree in your house? Collect items around your home and make a shop. Make up your own prices to sell your collected items to your customers.