I don't really know of any homebrew martial maneuvers past level 9 yet, but I can point you to some epic feats and progressions. Krimm Blackleaf made up
epic progressions for martial adepts, and even homebrewed
9 epic feats, 1 for each official martial discipline.
If anyone can help homebrew an epic martial maneuver, I'm sure he can. Though I really wouldn't recommend trying to put 10th level maneuvers in the game, lest you want to provoke the ire of other players (especially the spellcasters that don't get epic spells).