Just off the top of my head, i think a lovely shade of red would go well with...
oh, ya sorry, i forgot, no decor advice, got it.


That's a nice little layout.
Don't worry about the placement of the M60s. They have plenty of room as you have them. The sub might be a problem though with that crazy corner it sits in. I would recommend you do not put it firmly in any one place as of yet and instead, play around with its position in the room once the place is all together.

"Those who preach the myths of audio are ignorant of truth."