You asked which type of lighting I'm interested in: I thought I'd open it up to any DIY lighting options/plans/projects/sources etc that someone might know about and would like to share.
I'm a newbie. I haven't yet decided what kind of lighting I want. I'm just starting to put together a 150 gallon tank and I'm a bit "put out" by the price tag of some of "fully assembled"/"packaged" lighting solutions out there. I know there's money to be saved by building/assembling lighting myself. I'd rather spend money on more live rock etc, than have a pretty factory assembled lighting fixture.
You can save some money by using a retro kit rather than a prebuilt package deal. I think http://www.hellolights.com/ has got some good deals on lights. You can also watch the big boards (and here too) for people selling lighting setups. That will save you even more money.