This is an ideal nature craft if you want to involve your kids of all ages in the same activity at once. Everybody can work collaboratively on one huge mandala, or you could split the group into teams to add some competitive spirit! Provide a brief explanation of the history of mandalas and issue instructions, letting the kids organise how they will plan the design, collect the needed items and lay them in place. Turn it into a fun rainy day activity by clearing some floor space and getting creative with manmade objects found inside.