Hi just seen your question and yes you could use them on a feature wall all you would need to figure out is how you would fix them. I would probably drill holes in each till and fix batten to walls and then screw or nail them. To ensure a good fix as would cause injury.
Yes you can , but don't use in wet areas like shower walls , use a powdered tile glue & apply a sealer before grouting
Good inspiration for design , the best adhesive for it would be swimming pool plastic coated the one from Ardex. The problem you may unconter is the different in levels and the grouting of it. You will have to prime the back of it prior to installation and you would need to seal them too after you finish installing them. If you want more info on it get in touch. Ludvik My Bespoke Bathoom Ltd
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