Help Needed Adding Colour to a Sea of Cream, Beige and Brown in Living Room

[Mellowapple]

We are currently updating our living room, changing brass fitting to silver and accessorise from green to white/silver, we have a brown leather sofa at the moment the only other colour apart from brown/cream, beige is the green which I have grown tired of and want to change. I thought of incorporating some colour via new cushions but I am unsure of which colour, I did look at duck egg blue but worried this May give room a cold feel and a burnt orange.
The room is small and north east facing so not much natural light through day , I wanted to create a fresh and cozy feel if this is possible. Any advice on colours or decor improvement would be great.