I'm surprised your low iron splash back changed the colour so much, is it starfire? There are green and clear glass, but the thickness varies white the most. Trying to match your whites perfectly will always result in a slight variation, because the products different it's almost impossible. Very subtle tonal differences can be disguised if your splash back is enclosed or surrounded by joinery as the shadowing created allows for discrepancy. Otherwise, make colour difference intentional and find something that can coordinate and not copy the colour. Maybe mirror and remove colour from the equation

There are never right and wrong answers to this Cath....it can also become actually more confusing when you're not 100% and you get various/conflicting additional advice/opinions and then have to filter/distill the choices/options/opinions down to a final decision........when all else fails, trust your instinct/heart...you should "know" when it feels right....people sometimes ask why/how have I made a particular decision or move one way or the other, and sometimes my answer is simply "because it feels better that way than the other" - when it comes to design sometimes your "technical head" is your enemy ;)....sure the bench top material could look awesome as a splashback, but for you specifically the blue tile may be the better option, where it started and what you are drawn to......have you considered options such as a grey/earthy bench top? I've seen that done recently on a job (not mine btw) that combined with blue splashback tiles that you wouldn't expect to work on their own, but for what they were going for it was a perfect complimentary match.......when you get stuck with the decisions/palette resolution, sometimes freeing up and considering a lateral option is the answer to moving forward getting the balance and breathing space required

I hope the above video instructions are helpful. This is a project I will soon undertake to improve appearance of kitchen cabinets in a 1950/1960s kitchen, although I think mine are timber or timber veneer. I hope you will post Before and After pics as I'd love to see how yours turns out! Cheers.

what happened to the old column? i think you need to add a corner cabinet (900 on the stove wall and 1050 on the sink wall) with doors hinged across the corner provides 300 + 450 wide doors and better access to the corner for storage of big appliances and to allow more space for the drawers to open, the 1000 fridge space allows an air gap and two 750 wide drawers next to the 900 wide stove, i've kept the 1200 gap between benches and island and added a cabinet (opening toward the sink allows for a 600 wide 450 deep space for a bin) then two 750 wide drawers and the built in microwave making a longer island and extra drawers next to the dishwasher ...in my experience, if you're having custom made cabinets you only need to specify the size of appliances and sink, the general layout of the room and your preferred arrangements and approximate sizes and the cabinet maker should measure the site and custom make the cabinets to suit the space with minor alteration to allow for any obstacles eg like making the pantry cabinets narrower to allow for architraves around the entry door..and it's more comfortable to walk around if the pantry doesn't overlap the architrave or encroach on the doorway