Here’s a nice black theme and a set of wallpapers to go with the theme. iWalls Black theme is created by Blue Ray and and he’s matched up the theme with a nice set of wallpapers. The theme itself is compatible with a wide range of phones: 3rd fp1, fp2, E71, E66, 5800xm and N97, Samsung Omnia HD.
The wallpaper pack contains images which are 240×235. So they may not look too great on the wider screens of the N9, but should look good on the other supported models.