Very nice, although I would question how appropriate this is for business. It's lovely and cheerful, but in my experience, most business users prefer something a little less bright (like your dark blue theme). However, for other uses, it's very nice.
One comment about the actual colours though. I don't think the light blue alternate background on the grid display goes with the orange. The light orange is a nice contrast to the dark orange of the general background, but the blue is a little out of place. Might be better with another shade of orange, if you can find one that contrasts well enough, or something more pale yellow.