The way I square it, the Eldrazi are alien beings with an intellect () that we do not comprehend and thus ascribe it as madness () who consume worlds to gain power (), possibly for a natural reason () that is unclear to us at this time beyond the vague hints we got from Drana's experience. The Eldrazi see something as "broken" and are trying to "fix" it by scouring the multiverse clean.

How many of those cards are creatures vs noncrraturrs though. It would be interesting to see that too.

Also my favorite Eldrazi was Emrakul (yah I know the big dumb Timmeh likes the big dumb Timmeh card) and the only Emrakul call out was Emrakul's Appendix.

I thought it was a little weird how there were coloured Eldrazi in the first place, but I accepted it as a gameplay necessity. Now that the Eldrazi are in four colours it's a little weird they're not in white. They don't seem particularly disorderly, just hard to understand. I guess blue is the colour of mystery and to a degree, weirdness, so they show up there. Black is about selfishness, so that's justified (if we assume the Eldrazi are properly sentient and understand us as such too). Red, uh, yeah, I don't have anything for red. Green is a good place for Eldrazi since their primary motivation seems to be feeding themselves and they may or may not be sentient.
Did Maro's article give any reason for the colour choices?

Emrakul coming to Innistrad was kind of inevitable though.

Way I see it, Kozilek is UR, Ulamog is RB, Emrakul is UG.

And now Emrakul is going to create a new Titan from the two angels (assuming the story continues being predictable) and that Titan will probably be RU, maybe RW.