oh i loathe carpet but love rugs. we had carpet installed in our gameroom b/c it was concrete and i couldn't bear to watch my twins hit their heads on it one day more as they were toddling along...
i chose a light-brown poop colour.
: seriously. it was a hit of olive to it and it is really, really, really soft. i also do not like synthetic at all, it bothers me but we couldn't afford a natural soft fiber rug so i felt and felt and felt carpet samples until i found one as soft as could be without being cotton or certain types of wool.
i put down throw rugs on the areas that get traffic. on stairs or a hallway, i prefer tile or wood but if you do a carpet, be sure to tack a runner rug on over it. this will absord the traffic and dirt and can be easily cleaned. plus if you chose a runner/rug that is colourful, the stains will fade into the patter.
okay, that was a lot of thoughts, eh?