When you add a tag to your favorites, any question that has that tag is automatically highlighted in question lists, with the color #faf1e4. Problem is, the tags are almost exactly the same color (#f9f1e6). This, coupled with the fact that our tags do not have a border all the way around them (only on the left and right sides) make the tags blend in with the question box in a very confusing way.
To fix this, we could change the color that favorite tag questions are highlighted with. For example, changing the highlighting color to something closer to #f8e1bf, would make the tags noticeably different, and it matches with the upper bar (perhaps too much, but then, it's just an example).