It's too harsh and too cold. Orange isn't my favourite colour, but I'd prefer the orange to the blue.
The Blue is a very wintry colour. maybe a differnt shade of blue would be nicer. Or even if the rest of the website was turned blue.
However, given the predisposition of Wiki members to fall foul of depression, are we really sure that 'blue' is the right colour?
Perhaps a new colour overhall is required? Something calming and uplifting?