Lately, I've been spinning colored wool roving that I bought at the John Campbell Folk School.
It doesn't spin as softly (or as thin) as the alpaca I've been spinning, but I've really been enjoying watching the different colors get twisted into the yarn.
I have to also confess that I'm becoming a promiscuous yarn spinner. I have three spindles going now at once: one with alpaca, one with flax, and one with this colored wool. I'm such a fiber slut.