I'm not trying to start a fight!
Neither am I. I just want to help by pointing out to you the error in your thinking.
Colour is so subjective as to be unscientific (just look at the number of models that have been developed to map our three electro-chemical, not-so-narrow band receptors in our eyes to various mixtures of electromagnetic frequencies that we call light [wikipedia — http://en.wikipedia.org/wiki/List_of_color_spaces_and_their_uses]), and varies from person to person anyway so that it is largely subjective.
To get back to the person trying to find a use for 100 RGB LEDs, how about we suggest that he try to produce as many colours as possible: that would lead him into an understanding of the logarithmic response of our vision, I think.
Yes, it's subjective. There are lots of colour models but the only one relevant to this discussion is the RGB model.
My point is that, the only colours that are real spectral colours are those going from red through the spectrum to violet, then there's the colours which are mixtures: magenta, orange, pink etc. Colours such as brown and grey are just darker shades of other colours. If you want grey, the proportion of currents through the LEDs should be the same as per white but lower. The same is true for brown and yellow/orange.
If you have a little blue in brown the effect is to make it appear lighter, nearer to white, but dimmer so on a computer monitor it'll be a greyish brown. As you keep adding more even more blue, the colour will become more reddish, then purple when the blue exceeds the green content.
This doesn't belong here...but why do you prefer Opera over Firefox? I have both, and Chrome, and IE, but prefer Firefox because of all the add-ons available.
I've switched between Opera and Firefox and back a few times in the past. At the moment I'm using Opera because it's faster and more stable than Firefox. Firefox does have some nice extensions but I like Opera because it gives the functionality I need without adding extensions which are invariably buggy, slow it down and can become unsupported from one version to the next. People complain about the lack of adblocking in Opera but this can be set up, if you know how and works fine for me as I only need it for one forum I visit which is packed with advertising.
I don't use Chrome because the last time I tried it the adblocking was crap, it loads the banners, shows them to me before hiding them which just slows things down. Don't get me wrong, I'm happy for webmasters to advertise but one that site I visit oversteps the mark.