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Got the same problem trying to boot with MAC OS 8...
With MAC OS 7, never had any problem what so ever.
First of all let me suggest that U check if U really have a
Quadra 900 ROM, U can do that on the memory tab of the
GUI, there is a "more info" box that identifies the rom, there
are some .rom files that claims the they are Quadra 900,
but they really are LC III. The LC III doesnt support MAC
OS 8.
Seccond, the color issue it's really simple to correct; on the
screen tab of the GUI all U have to do is select another
resolution higher that 256 and viola! problem solved...

in a couple of days i will try to run the same configuration on
WIN XP and 98, to see if it's a ME problem.