More to explore:
Mosaic tile coasters!!
mod podge tile coasters
Transferring pictures to tiles. -- Coasters, possibly?
mod podge coasters
8 Mod Podge DIY Coaster Projects - great gift ideas! Maps from places u have visited together, photos, momentos from restaurants u went to etc...
DIY washer necklace - great tutorial for how to cover washers and give them the glossy raised look.
tile crafts painted cup coasters