Hello Lucy,

Thank you for your kind words. Regardless of the material, you can continue the pattern on the backsplash and over the edges, as long as, the slab is large enough to cover the area. Porcelain and Quartz (Caesarstone, Silestone, Colorquartz, etc) are available in larger size slabs than natural stone so it does make the process a bit easier. However, regardless of material type you can ask the fabricator to miter the edges just the same as they do with a porcelain, this will reduce the seams shown. I would recommend to find an interior designer, contractor, or fabricator that you trust to execute the project and help you along the way.

Good luck and I hope you find this helpful!

-Crimson Remodeling and Interiors