Completely by accident I have come by the ice-tea flavor of the summer for me: elderflower-mate.

2 umbels* of elderflowers
3Tablespoons of yerba mate tea
4 Tablespoons of sugar (or more or less, depending on taste)
a little less than a liter of boiling water

Let steep for about a day. Place bottle (or jug) in refrigerator.
Enjoy.

*umbel is now my word of the day.