Mint wines finish almost clear (colorless).

I made a green wine once with apple-mint jelly. I used 3 jars of
jelly and a whole bunch of pectic enzyme to break down the jell and
finished with a gallon of wine. I really tasted great, but the color
was a bit disconcerting.

Both blueberry and bilberry finish as reddish-purple, not blue. Can't
help you with that one.

Jack Keller, The Winemaking Home Page
http://winemaking.jackkeller.net/