One thing that's been bothering me since the release of the bicycles.se theme is the highlighting of favourite tags. I don't know if it's just me but I find the questions with favourite tags very difficult to see. I shouldn't be straining to see something that needs to be seen at a glance.
Take a look at the difference between the backgrounds on favourite questions on Bicycle.se and the beta theme for Bricks.se. (The text boldness is irrelevent as it doesn't vary for favourite questions)
I'd suggest a light colour that matches the sites colour pallete.