A logo needs colour IMO, and choosing a colour is almost as vital as choosing a logo because it will be part of the FSFE's "corporate design". So ... what colour should be associated with the FSFE? My personal preference is a soft green, but would do others think?
Just a quickie - please don't underestimate the importance of a monochrome (preferably black/white) interpretation of the logo. Think of practicalities - printing, etc. If a logo *needs* colour to work, that can make traditional media (i.e., printing) extremely expensive. A good logo *must* work in monochrome - otherwise, it will be extremely difficult to work with at shows, exhibitions, etc. That's NOT to say that there shouldn't be colour renditions - obviously, a flashier, coloured logo is suitable for web pages, for example, because there is no increased cost associated. But there are a multitude of situations in which a logo is required, and it should be as flexible and reusable as possible.
Also, where corporate colours are concerned, and also the logo, please remember accessibility - if a logo is going to be more than monochromatic in some instances (and there _should_ be a defined corporate colour set), please make sure it is of high contrast, etc. Not everyone is able to make out all colours. A little thought should be given to those with less capable eyesight, in terms of detail and colour. A logo doesn't need to be complex and flashily coloured for it to work well. An example in the UK would be the BBC (http://www.beeb.com/) - an easily recognisable logo, but extremely simple and monochromatic. I'm not saying the FSFE should be similarly simple, but there is a lot to be said for plain colour, primary colours, simplicity of layout and accessibility of design.
Cheers,
Alex.