Koinobori - Japanese Flying Carp
Did you know that Japan has a 'Boy's Day'? It is in May, and for each boy in the family, you hang a flying carp aka wind sock outside the house. There's also a 'Girl's Day' in March. The idea above, from the rather neatly named Squirrely Minds blog, uses toilet rolls to great effect. I think this is a lovely craft for boys and girls any day of the year.