I think Daisybell has a very good point, and would add that I think it's a good idea to avoid very strong colours at the outset, until you've lived through probably a full year in the house and know what the light is like in different seasons. A room which has good light in summer could be surprisingly much darker in winter and a very strong or dark colour could drain what light there to the point that you can find it downright depressing!
It's worth giving a lot of consideration to what lighting you need in the house together with the colours - do you need just a pendant light, something bigger, or additional lamps, or wall lighting, and so on.
As an entirely personal rule of thumb I'd avoid strong or dark colours in rooms that don't either have direct unobstructed southerly aspect, or dual aspect. And bear in mind that if you decide a very strong colour isn't right *after* you've had it painted, you'll need more undercoating for any subsequent lighter colour, and that'll cost extra too...