I've been trying out the liquid skin a bit more. It actually stretches and reflows (hence the name liquid). So the text area within the forum can generate a wider or narrower view depending on the degree of screen minimization. This is quite useful! (This is the same as the fixed skin only in the color arrangement!)
Xanthe, customizing the user profile is worth trying (if you are interested in doing so).
Customizing the member's (user) profile is entirely different to skins. Skins are applied to the entire forum viewing areas. Would be great to have colored skins available, as well as the option to apply the fixed or liquid settings to each of these color scheme's skins!