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In terms of background & border, IMHO, it really should be the white background - the logo doesn't stand out well when you have it on the green background. Green background is ok for the wbsite banner as we don't want the logo to be too distrating, but for a promotional sticker having a prominent bold style is desirable.
I'm undecided whether having a green border or not is neccessary. If we have the border, the logo has to be slightly smaller, to allow it space it breathe within the border. Do you have any reference of what other proojects have done wrt borders ?
To answer my own question:
There's no real majority either with or without borders.
In general, most probably no, but vast majority of the ones I have put around my working space follow a simple pattern - the border is just a few shades darker than the artwork area. Erik