I def can't say I know all the ins and outs of LJ... and I have yet to experiment with my own profile layout (I hear there are some diff options for paid accounts?).
That being said, I can try to help you - just let me know what you're interested in?! Like, I don't know if your current theme will allow a custom header pic or not, but I can send you the code for that and let you know how to use it...
just an example.
:)