Adagio Blueberry + Amanzi Raspberry Vanilla
The former is far too bitter for me and the latter is good but too simple, so I thought they might work well together. Because of the difference in steeping times, I ended up putting the blueberry (which is a black tea) in a teaball which I took out and the Raspberry Vanilla (herbal) straight into the cup.
It works well enough. The blueberry is still mostly bitter with little fruit taste, but the sourness of the raspberry does balance it out… or at least overwhelm it.