hmm, with blue you could have any variation of it (ie, dark blue, purple, lilac etc), or you could keep the colours 'neutral' so that it will go with everything (ie, whites, cream, silver etc). Depending on shade, you could get away with green too
in fact, sage green would probably go really well with that powder like blue!
When you look at a colour wheel, the 'complementing' colour to blue is orange/browns
However, the analogic colours (ones that are either side of the chosen colour on the colour wheel) are purples and greens, so I think you are best to stick to purple or green, in whatever shade you want really
xx