Blue logo is not visible on most of the backgrounds except on the last one.
+1
Nr 2 and 3 have such contrasted background that anything you'll put on top of them will be hard to read.
As for Nr 1, you could simply outline the logo with a thin white border, for instance, to make it visible. And you could do the same for Nr 4.
Otherwise they are great!
EDIT: I see most people voted for Nr3, which makes sense (Europe). But the high contrast of the background will make it impossible to read anything and see the logo. You have to do something with the background's contrast and also enhance the contrast of the foreground.