There are lots to choices to make when it comes to bedroom design (bedroom furniture, bedroom lighting, bedroom... gym equipment?) but, usually, the design starts with the all-important bedroom colour scheme. It's not a bad place to start since your bedroom colour scheme really sets the tone for the rest of the room.
For more inspiration
Stylish Grey Bedroom Ideas and Colour Schemes
Pink Bedroom Ideas and Colour Schemes
Your bedroom should be a glorious thing to wake up to in the morning and a haven to retire to at night so choose a bedroom colour which works well for you. This might be one place to ignore trends, unless a particular trend just so happens to resonate with you.