Ya know, the RV guys sometimes come up with the simplest ideas for things.
Here is one of those ideas.

If you a looking for a cheap way to get "chart lights" over even over head
ones for that matter.  They take the notebook USB LED lights, and cut off
the USB connector, add a dropping resistor. wire and an adel clamp and poof
they have a flexible light.  This is just too cool of an idea.  Might even
be worth finding the female USB plug and adding the dropping resister there.
Then you could just put ports around the cockpit and "jack in your favorite
light", including colors as well :)...

Sample at the link below.

http://www.designnotes.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=P
CUSBL&Category_Code=usll