The lack of 'u' is a parody of a parody of a parody of an xkcd strip (which was parodying a darth vader meme), I'm pretty sure. It was basically some darth vader strangling someone else and saying: "I find your lack of 'u' in honour disturbing". The point of me saying that was because I either do not see or simply ignore your posts, and both of those are sad. meet me at 2k!
As far as mister avatar goes, I think the black/orange switch concept might be good, but the current implementation is not spot on. I have one 'original' version which I applied filters to to get this current one. Inversion at that stage might be easier.
No, I have no ideas what filters I used, but it was in Paint.NET.