Oh that's going to be a stunning quilt!
It's looking like you have nice narrow logs, which can make it even more beautiful.
Remember, there's no rules ... the light side does not have to be as contrasting as yours ... sometimes the two sides might be different colours, such as blue/pink; or dark blues and light blues; black/red.
Other significant centre colours ....
Yellow ... the light in the window
Black ... quilts made after a death (RomanoJG -- the slave significance makes total sense, and I'll remember that one in the future)
Red ... represents the fire in the hearth (as per Ruck)
Here's two of mine. One with the traditional red centre. The brown one was before I learned the significance. The centres are all the same brown fabric, and after that, it's totally scrappy, hit and miss, keeping lights/darks to their sides.
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