I see blue, green, red, and yellow. I'd never heard of ecru before, but what I termed as yellow is not that far off from the ecru on Wikipedia's page. The color at the top of the circle is blue, though.
Disclaimer: Like Narz, I have flux on and it's night. So it may be different at day.
The interesting thing is that if I printscreen it, it's all black-and-white. A nice illusion.
Edit: Lol, Formaldehyde is right. I was viewing it in Opera 11 initially. After seeing his post, I tried it in IE8. IE8 is so slow that you can actually see it spinning as the GIF animates. There, it's clearly black-and-white, as it spins at 1-2 rotations per second. So yes, how fast your computer is and what browser it's running will have a potentially-quite-major impact on what you see.