The link is the reddy-brown bit and that isn't going to be changed. The green and blue are partly just for a bit of variety, partly to make the link distinctive, and partly because most of the other text colours don't work very well there. Blue tends to indicate a news story about ofpec, green something external. In summary
1) Glad you like it
2) No it isn't going to be changed
3) Yes I click on the green/blue myself sometimes, even when I wrote the bloody thing.