add a thin 3 4 thick pencil tile trim around the window in place of traditional casing install the tile on all four sides of the window opening creating a clean finished frame use mitered corners for a polished look and ensure consistent spacing and alignment match or complement the existing backsplash material and grout color for a cohesive design keep the installation tight to the window edge with no visible gaps preserve all surrounding surfaces and finishes and do not modify any other areas of the space
