Here's some in Ottawa...
US
http://en.wikipedia.org/wiki/Image:A...ttawahiver.JPG
horrid, over-fortified, Orwellian. Hardly a neighbourly embassy. I don't understand how the US can build something like that right smack downtown near the Canadian parliament (I believe it's physically the closest embassy to the parliament) and not be a little wary of inspiring a negative, paranoid and over-dominating image in Canadians.
Russia
http://en.wikipedia.org/wiki/Image:R..._in_Ottawa.JPG
not much better but at least not as huge and arrogant, and at least that entrance is a bit... cheerful?
China
http://en.wikipedia.org/wiki/Image:China%2C_Ottawa.JPG
not very Chinese-looking, hardly has right character. Looks like an old monastery
High Commission of the UK
http://en.wikipedia.org/wiki/Image:U..._in_Canada.JPG
Ew. Bad, bad and ugly office block.
France
http://en.wikipedia.org/wiki/Image:France%2C_Ottawa.jpg
Not the best example of French architecture. But at least it looks somewhat French.
Germany
http://en.wikipedia.org/wiki/Image:G..._in_Ottawa.JPG
Pretty banal I would say
Japan
http://en.wikipedia.org/wiki/Image:Japan%2C_Ottawa.JPG
Shy and uninteresting
Algeria
http://en.wikipedia.org/wiki/Image:A...%2C_Ottawa.JPG
Beautiful building, but nothing Algerian about it
Cuba
http://en.wikipedia.org/wiki/Image:Cuba%2C_Ottawa.JPG
A Cold War bunker (way to beat the paranoid-ness of the American one

)
Czech Republic
http://en.wikipedia.org/wiki/Image:C...%2C_Ottawa.JPG
Modest
Hungary
http://en.wikipedia.org/wiki/Image:H...%2C_Ottawa.JPG
Really beautiful building there!
India
http://en.wikipedia.org/wiki/Image:India%2C_Ottawa.JPG
Cuba meets Japan meets UK. not cool.
Indonesia
http://en.wikipedia.org/wiki/Image:I...%2C_Ottawa.JPG
Not as bad as it looks on this photo actually. I've been in it, it's actually alright. Very open.
Kuwait
http://en.wikipedia.org/wiki/Image:Kuwait_Ottawa.JPG
I find this one kind of cool. Very arab.
Saudi Arabia
http://en.wikipedia.org/wiki/Image:S...%2C_Ottawa.JPG
Same about this one!
Switzerland
http://en.wikipedia.org/wiki/Image:S..._in_Ottawa.JPG
Positively Swiss