Go fly a kite... at the National Mall.
From the Livejournal of Hasufin:
Rainbow kites. On the National Mall. Nothing "in your face", but if we can get enough people involved, it'll get noticed.
We've created a community for this. It's called gbltkite.
Due to the somewhat sensitive nature, it's going to be moderated for now. If you're interested, join up!
If you have a Livejournal, I highly recommend that all LGBT folk and allies in the DC metroplex give it a look, and consider helping us out. You don't necessarily have to be queer to join in - if you care, you're welcome.