We'd theorized that links taste better when blue, a subtle effect caused by a mental association with fake blueberry flavorings. But we were wrong. Instead, we got a pungent cyanobacteria aroma.
The original link color has been restored. Details on Meta Stack Exchange
Suggested text for the new off topic reason.
Questions of the form "What can I do with [ingredient]" are off-topic because they are subjective and lead to a long list of suggestions without a way to select the one that "works". This is not compatible with Stack Exchange principles. Exceptions are made for ingredients not normally considered food. For ...
That's just how it's always looked when you make a link on an image. The dotted line is the same as for text links, except for some reason displaced a line below the image. I agree it doesn't look great, and I'd love if they fixed it, but it's not a total accident.