I think grays and blues would look great! here are a few accents that may go with your yellow color. I also think that if there are a few pops of bright yellow you would be ok! http://deciture.com/antique-styled-floral-wood-metal-wall-decor-3-assorted/ http://deciture.com/artistic-styled-metal-wall-decor-assorted/ http://deciture.com/attractive-styled-metal-flower-wall-decor/ http://deciture.com/peacock-in-print-wall-decor/

a much taller head board, something to soften up the cabinets. the bench at the end needs new fabric, and possible paint raise the bed with risers on the feet. warm neutral tones.

What soft furnishings do you have. You could pic out one or two colours as an accent colour and use that as your Base for the curtains. I currently have cream hessian walls and have a duck egg blue and chocolate curtains. I'm currently making matching Oxford cushion covers for the settees . If you can't find what your looking for ready made buy the fabric and have bespoke curtains made for you.

Well it depends on your wall color as well . since you have such concrete looking floor I would recommend you can chose any electic color like lemon , orange , yellow to give a bright look and uplift room mood or chose any pastle color of your choice for subtle feel . :)