Ive done the same venture...here's what i used:
Amsterdam Flying Dutchman
Madrid Bulls (or Toros)
Brussels Railhawks
Hamburg Sea Devils
Warsaw Wyverns
(Polish dragons means I get to use this logo... its sick for any dragon based team)
Prague
Munich Disciples (the logo exists in real life)
Roma Virtus (or Rome Wolves)
Also, though you didnt ask for these cities--here are my personal faves in Europe:
Istanbul Empire
Paris Templiers
Ankara Falconers
Berlin Blitz
Lisbon Navigators
Bucharest Warriors
(again...just to use this logo)
If you'd like further suggestions, I also have divisions for
Africa
South America
North America (
East Asia (China, Japan, Islands)
Central Asia (middle east and India mainly)
And 4 indy leagues:
Australia
Carribean
Canada (For those lovely cities not included in the N.A.D.)
Norse Countries