All the advice about glass and tiles as a splashback are pretty permanent so why not try some other solution. I've tried tektura which is flexible and if you get fed up with it take it down and change your design

Behind your range i'd use a stainless steel sheet, Ebay's cheap, but just google stainless steel sheet, available cut to size all over the place. This one for instance is quite a size 2000mmx1000mm Ebay ( Stainless Sheet ). You can then use the car paint and the metal will take the heat as will the paint. Or to go with your colour scheme how about Copper?? copper sheet ( Ebay ) Plain Or, take a blow torch to it for patina??Copper patina sheet glass available from a trader on Houzz [Glass Splashback[(https://www.houzz.co.uk/products/copper-patina-glass-splashback-60x60-cm-prvw-vr~87224336)

Here is a photo of the mirrored splash-back in situ. It cost £230 which included the templating and fitting. I would recommend having the glazier do the templating and fitting as they should then take responsibility if it subsequently cracks within a couple of weeks of fitting...this happened to us and the glazier came and removed the cracked one and replaced it. Apparently it can happen if the fit is tight around the cut outs. We are really pleased with it.

For me the most important thing was how it would "go" with the rest of the kitchen. Also, as I planned the kitchen, I needed to understand how and how well, the splash back would intersect with the extractor, the wall units and the worktop upstand. FWIW I would never have had a printed glass splash back, although we did consider a plain white one. But the style of the extractor meant the splash back needed to be shaped around the extractor unit - not so easy with pre-made glass splash back. My biggest turn off with websites is bad grammar and spelling mistakes. I feel that if a company cannot be bothered to check something as important (and often the first interaction the company has with potential customers) then I would question how careless they would be with my order. I also hate pop ups and distraction on a page. For instance - and I hope you don't mind me commenting on your website - having the phrase "package deals available!" at the top of most product pages is a distraction for someone just looking for a splash back. It looks like it's a trade only thing and it looks a bit down market and a bit Trotters Independent Traders'ish. Perhaps combo offers may be better mentioned on a separate page of "offers" or a small section in the product information that combination/bundle deals of a splash back and worktop are available.