Eh, not much of a dark theme fan boy like most MyBB users are - I prefer lighter colors. But anyway, here's my most recent theme with both dark and transparency elements merged together.
A lot of CSS rather than images. Incomplete, still working on it.
http://i.imgur.com/MjovV.png
Good start Friend, hope it gets completed soon.
Yes, dark themes are not my preference either, are you looking for a critique on the theme?
If you are read on :
The double header bar effect with the navigation between is making the index look boxy and unbalanced.
I would suggest - move the "user panel" up to the very top. Change the search etc for image links (or icon font whatever) and float that right with the nav floated left.
The diagonal background just feels urestful - try a vertical pinstripe with very similar colours, carry on with the opacity to keep requests down.
The use of border radius is inconsistent - I would look at using a similar border radius throughout.