So I was thinking of some Litha things - to me Midsummer is blue and yellow - and red and white - crisp, bright colors. Perhaps a little green too. Water and sky, beach and sunshine.
Another theme is Finland - Finland is going to have it's 89th birthday in December 6th, and it would be nice to have a blue-and-white theme party on that day. Of course, it's half a year in the future, but better start too early than too late. And perhaps one could use some blues and whites as a counterbalance to all Americana :-)
There's some really cool American patriotic sock patterns around the net.
These are not too cool, but not bad :-) I love the star buttons :-)
There's a couple of problems with this though... the Finnish flag may not be worn or used as anything else but a flag. So a lot of American patriotic projects cannot be "translated into Finnish".
The second problem is that in the Finnish flag there's a blue cross on white base. Stars and stripes are fun, look nice how ever you do them, but I'm not Christian and I don't want to have things decorated with blue crosses... except the Finnish flag, of course LOL But, hey, challenges make the things only more fun, don't they ;-)
The Finnish coat of arms is pretty nice too :-) There's a lot of things one can do with lions :-)