Greg think you have made a great start, just needs a few colourful statement pieces. Firstly the chest of drawers are fab, my suggestion if you like them would be to utilise them in the lounge either side of the radiator under the window, for storing what looks like cd's the other side of the fireplace in these. You could put the existing cubes either side of the two sofa's. I would ditch the rug in the lounge, and get something bold and bright such as cobalt blue with orange/yellow. In the bedroom, keep the IKEA drawers and paint them either black or dark blue and have them adjacent to each other on the back wall opposite the bed, with the TV on top as someone has already suggested. The art work is great, but would swap it over to where the mirror is and move that elsewhere. Again ditch the rug, maybe an animal skin would work well in here, keeping a masculine feel. Pick some of the colours from the artwork for a well chosen throw and cushions for the bed, and don't be afraid to use some other accessories such as vases, lamps and dare I say candles!

I would have poo poo’d this idea before as I’d wonder what the point was, but make your self a mood board using the colours roughly in the same ratios. Are you planning on having some artwork as this may be the lynchpin that helps it hang all together. Pulling colours through from that will help the scheme. Tonal can be soft and soothing but needs layering up with texture to create a cohesive scheme. Alternatively pops of bright colour can look amazing and your kitchen is lovely and bright with good bones. What is the rest of your house like, and what is your style?

White doors against dark walls look great. It’s a lovely contrast.

You are quite right, it is the tone that needs to be similar, for example in the bedroom pic above the carpet is a lot lighter than the wall behind the bed, but much the same as the side walls. It works because they are just a similar colour, but lighter and darker. The herringbone stair carpet is darker, yes a similar tone. It just works. Hope that makes sense! I have Egyptian Cotton in my bedroom and hall, stairs and landing. I chose quite a colourful carpet on the stairs because I love colour, but that herringbone one is lovely!