We don't want to redecorate/get new carpet as in good condition and we have other priorities. Sofa has to be leather. Ideally, I would like a grey sofa but don't think that it will go with the walls and carpet. So I am thinking about getting a dark brown sofa (I know that they're not popular on here) with mustard, lime or orange accessories - I don't want teal as we already have that in another room.
Well beige/camel and grey are v. 'in' in clothes at the moment, so a tan leather could work well. I'd probably stick with varying neutral beige/brown shades for the accessories too, but no reason you couldn't add in a hint of teal to tie in with your other room without going OTT.
I think burnt orange with chocolate brown is really nice. Looks classy and cosy. I'm not a fan of grey. It makes me feel cold. Browns and creams may not be 'current' anymore but we're pretty much about to decorate our whole house brown and cream because it feels so cosy and homely.