I would advice you to go for all white and then have coloured art and accessories on the wall that you wished to have as accent wall. This way you won't be struck with one colour till your next repainting job. You will also have the liberty to change the colour pallet depending on your mood and season with just changing a few things like paintings ,cushion covers etc. involving very little cost and efforts.

House bedroom disighn

What's the price of this, ?

Wooden molding in HDF or Teak wood can easily be nailed directly on walls with headless nails. No need of ply or board at the back. Also don't go for POP moldings as they are not durable.