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I think it would be nice if the star you put on favourite questions would change in colour, just like a comment does as it get more and more up votes.
It could go from a grey outline (like it is today), to an actual golden star.
That would be problematic, since the star already changes color when you favorite and unfavorite.
As @Popular Demand mentioned in a comment. If the star stay the same then the number under the star could go from grey to gold instead. Which would be coherent with the way comment's score change in color.
Not an artist here, but perhaps six stars (or a clever use of transparency) could be used to display both indicators using a single icon.
Yes I would go with something like this:
Changing the star "border" can give it more meaning and look cooler to my eyes. :)