I'm currently working on the last tune for the fighting game.
As some of you may recall, I've been sneaking a lot of mixed-meter odd-meter grooves in that sound like they sound "normal". Here's the equation for this tune's ostinato:
5/8 (divided 3,2)
7/8 (unusually divided 3,2,2)
Which adds up to 3/4, which is not as "normal" as 4/4, but it feels really cool. I also love the fact that if you do enough of this odd/mixed meter stuff, then you switch back to a section of 4/4 time, the 4/4 sounds WEIRD!
Here's another cool thing I do with the groove in this tune: I've got a section that builds energy by cutting the time signatures down so that the downbeats are coming up faster -- I go from bars of odd/mixed meter 3/4, to bars of odd/mixed meter 3/8, to bars of 3/16 to bars to build intensity.
(I should mention that no one will ever notice or appreciate all this stuff in the game, but it keeps me entertained!)
Gotta go finish this tune... I've still got a bunch of cut-scenes to score...