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Dave, to a large degree the colour of the reflection nebula is determined by the frequency output of the most massive stars in the cluster and the compounds it is reflecting off. For example look at the "reflection nebula" around Antares, it isn't blue it is yellow/orange. This is not just because of the colour of Antares, but also because it isn't just reflecting off predominantely hydrogen gas, but a lot of other "contaminants" being expelled by Antares .
But 99% of the time reflection nebula are being highlighted by very big hot O and B association stars reflecting of predominantly hydrogen. If you want to get a colour that is close, then check out the spectral range of a Hertzsrung Russell Main Sequence Diagram. That should give you the best place to start.
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