The high elf army contains two units of fast cavalry, here is the first one ready to go. I think these guys are from the Isle of Blood set too, and they are a big improvement on the old models, like the swordmasters were.
I opted for tan on the horses to visually mute them against the bright colours of the riders. My other options were white/grey or dark blue/black, but neither of those felt right. Luckily, a quick look through the army book and a WD confirmed my opinion.