Really, all of those fanfares are very similar in composition. They love natural minor scales, harmonizing in 3rds and always having a "bass" voice.
Try to make something different thant that, though. Be careful, though, about the characteristics of the tuba ensemble. If you use a MIDI playback, though, you should get a decent idea of what performance would sound like.
And please, please, please, please make sure you keep good time in whatever it is you come up with. Hearing these sporadic fart noises on YouTube is like listening to the background blasts and such from a battlefield...
