When one of a question's tags are one of the tags I chose, the question is being colored to help the user notice that this question belongs to a tag he/she marked.
I think it is better if there are different colors to "more than 1 tag" match.
So, for 1 tag match - today's color.
2 tags - color 2.
3 tags - color 3. etc.
This will help the users to find more relevant questions more easily.