I've looked into RGB modding my 64, but it requires a specific model #, and I've looked into the results of some amateur RGB modding attemps and the majority seem to have some kind of dim screen/flashing problem or something.
Eh emm, I wrote that, googled RGB mod N64 really quick, and found this: http://www.gamesx.com/rgbadd/rgbn64.htm
Seems easy enough. Might try it some time if I get another 64.