What sort of floors do you have? What shape is your kitchen and where is the fridge? I think an all black kitchen is most suited to a large space with a lot of natural light. If you have that it will be fine. :) In a small space without natural light, it may look dark and the black gloss may be a little overwhelming. If you have a kitchen with a defined back wall, another wall to the left/right and an island, you might want to put the gloss fridge and cupboards all down the side wall and on the island, and use a contrasting colour for the other cupboards. Perhaps a timber or grey timber look laminate and off white to warm up the space and bring in a bit of light. Depending on what you do and do not like as well as what is going to be reflected, a mirror splash may bring in a little more light as well. Goodluck with it all.

Match the bench top to a glass splashback. I would suggest metallic grey. The metallic range is not as it sounds, all sparkly! It's really quite calm but more interesting. After that you can add colour with accessories. You really don't want to add anything to bland, maybe even try a essa stone display centre.

I'm going to suggest these grey Montage tiles. I think the Como tiles are nice too. Dark grey will add drama and balance out the dark sink. The mixed tones will tie in the variations of grey and silver in the bench tops, appliances and glass door frames. The stone/slate look will add a natural element to complement the wooden floor and balance out the laminate. If you do go for colour, I like Bernadette's suggestion of complementing the glass colour. A tile that looks like pale jade might be nice.

As long as you balance your room (or in this case wall) you don't need wall cabinets. The wall looks somewhat unbalanced in the render but that can be easily corrected with a splash back, art, rails (such as those you get from ikea) or open shelving. Open shelves shouldn't get greasy if your range hood is working well but they do get dusty.