In my DR250 build thread (see sig) I originally had the same plans as you to go 2-tone paint. I ended up just using a single color and am glad I did. Looks WAY better (IMO) and WAY less work as I already had at least a hundred hours on paint for the 8 of them.
Take a look:
The speakers are lit up with a blue LED stage light, 1 each side for the tops, 2 on the subs. The video doesn't do the them justice, for some reason LED lighting doesn't translate well over video, they are a focal point of the room in person.
Just for interest sake, the whole point of the video was to demonstrate power shading where the bottom cab is at a lower volume than the top cab and the top cab has more top end (treble) than the bottom cab. From the back of the dance floor right up to a foot away from the stack the volume level and tone stays pretty much even.