It can be done in any material, clients often use the same material that their countertops are made of so that it matches nicely. However, you do not always have to do that, you could always add some blue or green tile material to contrast with your neutral colored countertop. This would help give your bathroom an eye-catching appearance! A splash is not just for looks, it is beneficial as well because if you splash water or soap onto the walls behind your sink, this acts a blocker and will stop anything from hitting your nicely painted wall.
I often find clients wondering if a backsplash or splash is the right way to go for their bathroom and kitchen. You need to weigh out the pro's and con's when it comes to your space. For instance, if you have a smaller vanity with very little room between the countertop and the base of the mirror, go with a splash because it will give the illusion of extra space. Check out this image here, if you like it a splash is for you! If you have a large amount of space between your countertops and cabinets or mirror, I would go with a full backsplash because anything can splash up onto your walls and ruin the fresh paint, and I know you don't want that! Check out this image here, like what you see? A backsplash may be for you!
Personally, I like backsplashes for both bathroom and kitchens because they serve a purpose plus they add a great aesthetic value, especially if you like to add contrasting colors like I do. Come on, you know contrasting colors make spaces fun and eye-catching!