It seems that FG and BMX bikes go hand in hand in many ways. I've posted a host of videos of people doing (often just trying to do) things that are basically BMX freestyle tricks on fixed gear bikes and I've also posted some cool fixed gear BMX bikes.
Maybe now is the time to see some of those BMX tricks done with a fixed gear BMX. Trevor Meyer is your man, just watch him.
And here's another video of him showing off, this time with a regular freewheeled bike but I love this just because of there's KRS-One as soundtrack.