You will need:
– Coaster mold
– Resin – I used Easy Cast, but Envirotex Lite works well too.
– Cello glitter – blue and white (available at Michaels and Hobby Lobby)
– Clear Mod Podge
– Picture of a shark, sized and cut out
– Nail polish – light pearly blue and white (optional and acrylic paint could be substituted)
– India ink or resin dye
Do It And How 
Genius !!