I am not very good at design but I managed to make a logo for my board which worked well with the Subsilver2 theme on 3.0.4 and 3.0.5
The background of the logo was the same colour as the solid colour bar used in the header so it seemed to blend in seemlessly.
However, I am planning to upgrade to 3.0.7 shortly and the header seems to have been changed to use an image (background.gif) rather than a solid colour meaning my logo no longer blends in.
As I am rubbish at graphics manipulation, I would be very grateful if anyone could somehow fix this.
(I suppose the alternative would be to edit background.gif to make it the same colour as the logo, which I could probably manage, but I quite like the look of the background now.)