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Edited by deletedusername - 12/6/11 at 4:01am
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St. George's is the English / International school. http://www.stgeorgesschoolcologne.de/
For something completely different there's the Freie Demokratische Schule in Nippes. http://www.freie-schule-koeln.de/
I personally don't like the public system as it funnels kids into three different schools at around age 9 or 10, and which one they end up at will likely influence their future career options. I just think 10 years old is too young to be directing a person towards their career.
We're going to try Waldorf, but our son is just one and will be starting their Kindergarten in a year, so I have no experience. I have learned a lot about what a Waldorf education is through reading the Waldorf forum here as well as a few books.
Hey are you into meeting up with other AP / NFL mamas in Cologne? There are a few of us regularly meeting, we'd love to have more. 
International Peace School in Widdersdorf.
My kid isn't old enough yet to go to school, but I read one of their flyers and liked the concept.
They're quite expensive though, I believe.
http://www.if-koeln.de/en/welcome.html