Office Edit?

My home office has blue walls, and while I'm very fond of the colour (Scribe from General Paint), nothing in the room really relates to the walls.  

An old photo - the art has changed over the dresser, the chair will be reupholstered (once I decide on a wall colour) and the desk and side table (not shown) are getting new skirts.

The rest of the room is all linen and gray and off-white.  

So I'm thinking of painting the walls something like this:

Sherwin Williams Anew Gray.  SW has some gorgeous grays and greiges.

It reminds me a lot of BM's Revere Pewter, a perennial favorite which is a bit lighter and grayer:

I love the blue but it doesn't relate to anything.

I couldn't figure out why my office lacked coherence (maybe it's all the misfit furniture) with its beautiful blue walls until I realized that:

Decorators repeat the wall colour in the accessories and it helps to tie the room together.  

 For example, in blue and white bedrooms, the blue is often repeated in pillows, or the bed skirt, say, and the room looks "pulled together".

Maybe this is Decorating 101, but it really never occurred to me because I always use neutrals in walls and furniture and it never became a conscious issue...it always just worked. 

So with that wisdom, I'm rethinking the blue, since I am not really keen to repeat the blue in fabrics (I'd rather go neutral)!

Such a beautiful medium blue.  I might redeploy it in my downstairs bedroom where the current pale blue doesn't have enough gravitas for the low light...

I would really love to add wallpaper to the room, like this Farrow & Ball paper:

Silvergate BP-804

Or this one:

Orangerie BP 2502

However, at $300 per roll (3 roll minimum), this could be a very expensive experiment!  Plus, I'd probably have to hire an experienced wallpaper hanger.

So I think I might be a coward and just stick with greige walls...

What do you think?

Do I keep the pretty blue and introduce some blue accessories, say a blue pillow on a future linen chair, etc.?

Or do I go greige and make a neutral scheme (with lots of white and black and wood as my accents)?  This might look better with the neoclassical elements I seem to be collecting in here.

Do tell!