Hi I'd go the colour of the wall. I love a white kitchen :) If you're looking for a point of difference, however, you could add some colourful cook books in the corner. You could also add little door knobs along the top cabinets, if you want, too help break them up a bit. Although drastic, removing the cupboard doors above the fridge and filling with colourful cook books would also add a pop of colour. It would still be in keeping with your shaker style too. Although, I'm sure you've just spent a lot on those doors, lol. Anyway, I think you've done a great job. It's a hard space to work with, small and u shaped. I can now appreciate the difficulties in working with an odd shaped kitchen! It's hard to get symmetry, so it limits what you can do. I'm about to do a similar style kitchen and was wondering what colour you used on your cabinets? They look great :)

In the Brooklyn Brownstone, the paint colour is Benjamin Moore's Decorator White. An "eggshell" finish for walls and satin for the wood trims.

I would let your natural elements shine ..match your wall colour to your classic white laminate and be lazy and paint the same for the ceilings so not to distract from your features or you could use your Caesar stone Urban as an inspiration and choose that colour as wall colour..ie go a bit lighter ..since you can play around with the colours as your room has lots of natural light .. Urban is a nice colour..brownish grey.. personally I'd just go white..

I favour stone against cedar wood tones. It's a cool neutral and usually contrasts with the warmth of the cedar beautifully. It also creates a neutral backdrop against which you can accessorise and change to your hearts content without needing to repaint. Here's some idea's from Taubmans site.... https://www.taubmans.com.au/homeowners/colours/colour-trends I would probably go platinum or pebble half. Although those colours look heavily pigmented on a chart, against the richness of cedar they would appear very pale but not as stark as a white. It's also quite period correct and easy to live with.