Is that a McDonald's UK thing, or do they use the green elsewhere? It does feel 'right', especially in high street facias - but it doesn't feel like it would fit in as well in other countries.
[edit]
Having spent a wee while looking at photos of random stores from around the world on Google Maps, it seems to be a Europe (including Russia) thing. Also it seems the 'make the store look like it's not still in the 80s' refresh doesn't seem to have made it to much of North America.