We use and like Hertro-seal. Even on white grout it seals it well. We apply with a small paint brush and put on several coats. Process should be repeated every 3-5 years.

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.

anaewlo - did all this just over 12 months ago so know how valuable an extra pair or eyes and a clearer head can help. The "little" things are the ones so easily missed and the ones that make you ask "what was I thinking" or "how did I miss that". You could take the tiles up higher immediately behind the hotplates, the range hood would then tie it all together and you could even have some nice artwork each side of it. The only concern I have - are the 2 tiles in the second row centred over your hotplates? Fine if they are as you will have that high part nice and even. If not, I'd a have good think about it. Otherwise, assuming you will paint the walls in a semi gloss paint, the lower tiles will take the brunt of the oil and what goes on the walls will be pretty easy to wash off, it is just a matter of wiping it down after each cooking session. There are times to match things up and there are times to blend. With your downlights, keep to white (assuming you will paint your ceilings white). this way they tend to disappear into the ceiling

I have white floor tiles. We used the plain, concrete grey. Best thing ever. Easy to keep clean and break up the plain look. Good luck !