We have installed wallpaper behind glass splash backs on many occasions without any problems, the glass usually being attached by a thin beading of clear silicon applied around the inside perimeter of he glass, then fitted the day after the wallpaper install. MOST importantly the INSIDE of the glass be kept perfectly clean on install as even fingerprints will stand out

We did pressed metal splashbacks on a display in a kitchen showroom I used to manage, and as such many of our clients opted for the same look. Powder Coated is definitely the way to go. It stands up really well for durability and is in fact relatively easy to clean compared to many splashbacks. Often people think that glass or stainless steel are the easiest for cleaning, but due to being such a flat reflective surface they show up every splash and if you're going to clean them you really have to clean the full length of splashback. The textured surface of the pressed metal means that it doesn't reflect the same amount of light so you are able to get away with cleaning it less often, and you can also get away with just cleaning the dirty area rather than the full length. The biggest difficulty we found was getting the splashbacks installed as there aren't really any tradesmen who specialize in fitting pressed metal, and those that were willing to cut & fit it were concerned about what would happen if they damaged the paintwork. We had the panels cut to size first before they were powder coated to minimize the risk of chipping the surface.

As everyone has said it looks good but sometimes you just need to update and change. There is products available, Kerlite porcelain cladding for one. Kerlite is a thin porcelain cladding that comes in many colours and textures. Can be used on walls floors bathrooms, outside etc. I had a small court yard with a door leading to the garage. I covered the door and the rendered wall to make it all flush and create a feature wall. Basically there is nothing you can’t cover and the colour and texture range now is unbelievable. Kerlite is definitely not a diy job, you need the experienced tiler. Also it’s been out for a while now and I’m pretty sure there is tile cladding etc etc. maybe google porcelain cladding, there will be similar products. Check it out I highly recommend it.

We had a guy who printed posters print the photo and stick it on the glass for us (to make sure there were no air bubbles). He delivered it to the glazier who was installing the splashback. There was so much interest as it sat in the showroom, the glazier then started offering glass with pictures actually printed onto them... If your wall was smooth, you could put the 'poster' print onto ther wall as another option.