Honestly I think the best color would be chrome or silver. It could be like a brushed chrome or silver to give it a different look but thats what I would say.

I would like to change the lights inside & the back one two can anyone tell me how to remove cover without doing any damage

Are there any headlight replacement kits?

I'm curious what is out there.

With the interest in "old school" conversions, like the Gangster kit and my own general ideas, are there any headlight kits that replace the whole unit with an alternate looking one?

For the money, bro, I'd suggest just getting the Fig Engineering one from eBay.  I'm sure they'd be willing to sell you just the bottom.  The Grillcraft is a lot of money and I think you still need to keep your OEM lower grille in place.  I know it's this way for the upper. 

I know I'm still waiting on better options.  I could build my own, but I don't have the time nor funds to do so.  Just like making speaker pods in the rear "pockets".  I could make some fiberglass ones in a weekend, but I don't have the $$$.  And I don't need that much rearfill...