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comment How can I achieve smooth shading / glow from one tile to another?
@Byte56 that's a good suggestion though a bit problematic (I'll actually need 9 vertices to model this accurately, I believe) - updated the question to add it as another alternative. If you think that's nevertheless the best option, or that 4 vertices are enough, please do add an answer below.
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revised How can I achieve smooth shading / glow from one tile to another?
Updated as per suggestion
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asked How can I achieve smooth shading / glow from one tile to another?
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comment Given a RGB color x, how to find the most contrasting color y?
Here's a link to a video showing the rotating bump in civ5. In this case, though, the outline is not actually multi-colored.
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comment Given a RGB color x, how to find the most contrasting color y?
You can add two outlines - e.g. an inner bright yellow one and an outer black one. If the item and background colors are different, the item will stand out anyway. If they are the same, the player will either see a strong yellow outline if they are dark, a strong black outline is they are bright, or both outlines if they are in-between. As for animation, I guess I'd consider either color change or a "moving" animation like you describe. I remember seeing in civ5 a very elegant solution of a small "bump" in the outline that constantly circled around the perimeter.
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comment Given a RGB color x, how to find the most contrasting color y?
Not to diss the great answers below, but - have you considered just using an outline (or in your case, an additional outline)? e.g. take a look how the text here is clearly visible over both light and dark backgrounds, due to it having an outline in a color that strongly contrasts with the text color. Will also make your coloring choice consistent, which is a plus imo. Just a thought. And if you need to really make it stick out, you can animate that outline!
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answered How does one prevent homing missiles from orbiting their targets?
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comment Peer-to-peer first person shooter
@IDWMaster cool, and if you don't mind me asking - how did you end up structuring the graph?