This is a fun and easy challenge you can give your kids to help them get active and work on their colour recognition.
Give your kid(s) some colours and tell them they need to go around the house and collect items that are each of those colours.
Give your kid(s) one colour at a time and have them find 2-3 items in that colour.
Give your kid(s) 5 colours and tell them they need to go around the house and collect 5 items that are each of those colours.
Give your kids two-three colours that mix together to create another colour (ie. red and blue / white and red / blue, green and white) and tell them to find you 5 items that are the mixed colour (purple, pink, turquoise).
Give them a hard colour like peach, lime or gold and have them find items in those colours.