Have you considered just using stainless steel sheet. I have done this in three properties. It looks good and is relatively cheap. I have details of a supplier that I have used in each case if you need it.

Love the effort you're going to. But I'd have the entire island inc step down in the one colour, and the cupboard bench and splash back in the second colour. Remember once you add accessories and more importantly yourself the area will have plenty of movement and variety.

Great job on the kitchen and I agree with some of the former comments - a glass splash back would look good and the silver seems a good choice. If you decide to go with tiles I would suggest a White Tile with a smattering of Black and Grey markings with the colors prominent not subdued. I wouldn't think Brown but why not experiment with a few different colors and see how they look and in conjunction with other colors until you come up with a match. Only a small area but nice to get it just right first go. Good luck

Hi, since your kitchen is small and there's a lot going on I would go with a very light coloured back splash. A very light warm grey as suggested could work nicely here. It would also brighten up the area a little. I certainly wouldn't introduce yet another colour. Introducing something like a bright red will draw attention to the backsplash area, but the design of the kitchen doesn't lend itself for such a high impact visual focus. Keeping it calm and neutral will make the kitchen look more like a unit rather that bottom and top cabinets with a big red/black/maroon stripe through it. The company supplying the back painted glass should either have a range of available colours to choose from, but usually any standard RAL colour should be available at a minimum. They will most likely have the RAL standard colours fan available for reference as well. I'd go with the one of lightest warm grey shades that is in the standard range. Your worktop has warm tones in it, your wall is beige, going in with a cool grey will make each colour look "off". The last thing I'd recommend is black. I know it has been mentioned, but it is just too strong of a contrast and non of the other materials and colours would support such a stark, contemporary choice. If you are worried that the existing dark red paint will alter the colour of your new glass back splash, and that's a very valid argument btw, just paint it over with two coats of white prior to installing the new back splash. I'd do that a few days prior to installing the glass to make sure the paint is nice and dry. In terms of maintenance a glass back splash is probably the easiest to look after since its so easy to clean and there's no grout that can attract dirt over the years. Good luck with the renovation :)