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Needless to say, our existing diagram color schemes vary by document and
sometimes look rather hideous. For example, I used the red-green-blue theme
in the installation guide to improve contrast among the networks, but it
lacks the civility you would find in other professional documentation.
Similar to networking, colors are hard. For example, themes that implement
many shades of one or two colors look professional but limit the ability to
contrast important items. On the other hand, themes that implement many
diverse colors offer many ways to contrast important items, but look harsh.
I haven't found a theme that provides a decent balance until Robb Romans (a
coworker at Rackspace) pointed out the Solarized theme [1] today. Although
somewhat optimized for text, this theme provides several decent dark/light
combinations for diagrams requiring less contrast and a series of diverse
yet soft colors for diagrams requiring more contrast. After messing around
a bit, I came up with a few potential color variants using this theme.
Please review the dark/light example for simple diagrams [2] and the
diverse color example for complex/contrasty diagrams [3] and provide
comments. For the first diagram, indicate which of the controller node,
network node, compute node, and block storage node objects look the best
(ignore the object storage nodes). For the second diagram, indicate which
of the nodes (dark/light) and network colors look best. You can also reject
this theme completely. However, if you do, please provide one or more
suitable alternatives. I would like to upload a series of revitalized
diagrams to the installation guide as soon as possible.

Matt

[1] http://ethanschoonover.com/solarized
[2] http://23.253.231.218/rpc-diagrams/os-examplearchneutron-hw.png
[3] http://23.253.231.218/rpc-diagrams/os-examplearchneutron-networks.png
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