You might like to have a look at our top 10 most popular laundry renovation projects for splashback inspiration. Using tiles as a splashback will be the winner in most scenarios from a convenience point of view. However, I'll also be interested to see what our members have come up with.
I believe the Hybrid vinyl planks would be a better option than the stick on alternatives over tiles. The stick-on version is very thin and lacks an underlay, making them prone to distorting over tiles and showing the tile outlines after some time.