dopelover: the proposed tango with colors theme has some improvements for dark backgrounds. Anyway, keep in mind that it's almost impossible to make an icon set that looks fine in any background and maybe a custom icon set would be better for such dark background.
In my opinion, the tango icons colors perform far better (although they can be improved) in a dark theme than the default set.
Did you try the reworked default theme on that background? It would be interesting to see the different themes and compare
dopelover: the proposed tango with colors theme has some improvements for dark backgrounds. Anyway, keep in mind that it's almost impossible to make an icon set that looks fine in any background and maybe a custom icon set would be better for such dark background.
In my opinion, the tango icons colors perform far better (although they can be improved) in a dark theme than the default set.
Did you try the reworked default theme on that background? It would be interesting to see the different themes and compare