I know tiles are the obvious solution, but the entire bathroom is already tiled to eye level with tiles which would be impossible to match.
I was imagining that it would be possible to add some kind of clear perspex to protect the walls over the tiles, where the new shower will be, but I can't seem to find this available anywhere.
The remaining options are adding some kind of wetwall product, or aquaboard - which I fear will look naff, or adding white tiling of a matching size, and painting the lot white with tile paint - which would be only a temporary measure.
Alternatively we could retile the whole bathroom, which is a project I don't want to take on at this time.
Any suggestions would be much appreciated.