Does the text color of your link matter? According to a Google patent granted a little while back it just might! You can view the document yourself here.
But let’s spend a little time with claim 18,
The one or more server devices of claim 16, where the data associated with the features of the one of the links includes at least two of: the font size of anchor text associated with the link, the position of the link within a source document, the position of the link in a list, the font color associated with the link, the attributes of the link, the number of words in the anchor text associated with the link, the actual words in the anchor text associated with the link, the determination of commerciality of the anchor text associated with the link, the type of the link, the context of words before or after the link, the topical cluster with which the anchor text of the link is associated, whether the link leads to a target document on a same host or domain, or whether an address associated with the link embeds another address.
This claim gives us a lot of good information on how text links might be valued but by color? It might have something to do with detecting hidden text (for instance if the color of text matches the background color a flag is raised or the link is discounted), but I would bet some serious money it is just a matter of time till we see some quack SEO’s offering Bill and Jimmy’s Rainbow Color Link Building Service, claiming that they will garner you hundreds of blue, green and yellow links for $xxx a month. Guaranteed to get you to the number one spot or your choice of a full refund or a case of multi-colored lollipops!

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