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.

Thank you everyone, your thoughtful advice was very welcome. I'm attaching a photo as its all finished. I selected Olive Reserve for the splash back and painted the wall above it the same colour. As its a big room with lots of light and a large window it doesn't dominate. The glass is so easy to keep clean and I love the way it reflects the garden and light. Have to say though some people are stunned into silence when they see it, but as the cupboards and bench tops are quite bland I knew something bright was needed

I agree! Go for what you love. Down the track at resale time, if you feel it's too dated then, there are many splash back materials that can be applied right over top of tile. Is it just the area behind the cook top that will be tiled? I think anything will feel like "too much" at first if you've become accustomed to how it currently is. It's like when you paint a room. It can feel overwhelming at first until you begin to put furniture and decor back in place. A simple way to trial colours is to tack up some wrapping paper, fabric, contact paper (backing left on) or whatever you find that has a colour you think could work. Try use things with different sheen/gloss. Even paint a board and prop it there. Leave for a few hours and see what does and doesn't work for you.

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.