In my opinion you don't need to consider your bedroom furniture too carefully. The shelves you choose should coordinate nicely with the fixtures in your bathroom, because those fixtures are there to stay until you renovate whereas your bedroom furniture could be moved out at any point that you want an update.

What about shelves that are painted a shade darker or ligher than the wall? They will recede and not stand out as a feature and will still be somewhat distinct from the wall colour.

How would you feel about trying some glass shelves with metal mounts that match your bathroom fixtures? That could keep things feeling light. I personally think it would look strange to bring the mango wood color into the bathroom next to the dark cabinets.

you could paint your bathroom walls and shelves both the same color as your bedroom walls.

If any of your shelves are going to be for towels, add doors or they'll get damp from the steam from the shower.

You might move your art to your bedroom, both for that same reason and so you have room for more shelf/cabinet space over your toilet tank.

http://www.associazionelenuvole.org/post.html#dF9vdmVyIGNvbW1vZGUgc3RvcmFnZSBjYWJpbmV0cw==

You want to put the shelves over the toilet?