These tiles warm me up just looking at them! The secret is to use orange fused glass--I have two shades (one is more of a tangerine).
Mixing these colors a la Josef Albers, I found such pleasing combinations. My mother is sure to love them, too--she is definitely a "summer." Enjoy!
www.OmegaArtDesign.com and click on "Custom Fused Glass Tiles."