No good ones that I have seen. Since most blocks come with clear tops you could mod one any color you wanted. You could check out the orac^3 project at www.bit-tech.net to get an idea of how to make your acrylic glow.
The Thermaltake bigwater has a blue led on it. It does not have a sensor though. xoxide has it for $53. You might be able to find it cheaper I didn't look very hard. The par number is CL-W0010.
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