Lava stone bench is fantastic! You have great taste so I am sure you will make it all work. As with any room, maybe just consider which element you want to be the 'hero' ie. do you want people to notice the benchtop first, the rug? Then play up that feature and blend the rest into the background more. If you have too much going on colour or pattern-wise the different elements of the room will compete with each other and the room won't have it's focus. Love love your bar chairs as well!!! :-)

Have you had a look at the Dulux colour wall on their site. Some great khaki type greens.

What a great looking sink!

I do like the design but wonder how easy or difficult the postie would find accessing it, but that is not a design issue. Agree with bigreader' observations. It goes well with the house.