There are several options for backsplash with yellow granite countertops:

1. White subway tile: This classic option will brighten up your space and provide a clean contrast to the yellow countertops.

2. Neutral mosaic tile: A mosaic in beige, gray or cream will provide a subtle pattern without overwhelming the space.

3. Glass tile: A translucent or iridescent glass tile in a coordinating shade will add a modern touch and reflect light.

4. Bold statement tile: If you want to add some color to your space, consider a bold patterned or colored tile to create a stunning focal point.

Ultimately, the choice will depend on your personal style and the overall aesthetic of your kitchen or bathroom.