One more STRONG recommendation for Wet Okole's. Not cheap. Not quick. Not necessarily as easy to install as others may report. All that said, I asked the same question here and found the advice to be 100% on the mark.
I went straight black without any of the "tubes" or logos. Be advised that any two-tone will likely not give you black headrest covers. These were for my Son's 4Runner, who works as a tradesman. After driving my own T4R, when I drive his I actually prefer the look/feel of the WE covers vs. my factory seats. You just can't go wrong with that investment.