Definitely black, not having to sleep would be like extending my lifespan and enhance quality of life and health so much. Plus, it doesn't say I can't sleep, so if I have the time and feel like dreaming or want the relaxation, I can still go for it. It would also free up so much time that I don't have to sell my labor, it would significantly lower my personal rate of exploitation.

Next would be talking to cats, because I love cats and already feel like I can relate to them. They might turn out to be quite dumb, though. That's okay.

Blue sounds good, though I don't want the effect of the pill to force people to find me attractive. Rather, if the magic pill made it so I'm only really attracted to people who already find me attractive, that would be fine. Of course finding someone attractive doesn't mean wanting to date them. But still good.