I'd prefer it if the colour was a bright colour in general. Maybe not green though. :/ And since it's an art site, I was thinking 'splotches of paint' everywhere would be better than one simple colour.
It would be nice if they changed the color once in while, after all we celebrate all sorts of holidays and events. I do like the color green for this site because it is very suitable but maybe trying out different colors couldn't hurt.
There should be 3 (or more, or less) options- DA green, obviously, and then a lighter color (probably not white that would look a bit weird with some people's art) and maybe a charcoal type of color so people could choose whichever they preferred.
Green is a color that calms you down when you're stressed, but I think the designers added a bit of grey to it so the deviations can look more colorful and attractive compared to the background, so I like it!