Originally Posted by CWS4322
Concentrated Pomegranate juice, raspberry syrup, or cherry syrup should also work. I'd probably juice the pomegranate and reduce it to a simple syrup.
I was actually thinking cherry juice myself. If you macerate the cherries in some sugar and then reduce and strain it, you should be left with a dark red sauce that would make a nice base for your frosting. I would also go neutral with the cake - maybe angel food or a simple white cake. Otherwise you might end up with some flavors colliding.