Deep green is too dark! I have a Boston Green M3 sedan and is looks great IMO. The problem is, if your like me, and like to have color on your car, Deep Green does not satisfy that desire. I feel the same about Monaco Blue, just too dark.
I think the E90 would look good in the right color of green, something more like this,
as compared to this.
Unfortunately the configurator does not do metallic well, which is always the key to a good green color.