add the butter & marshmallows in a bowl and melt them together. This can be done in the microwave or on the stove top.
add blue food coloring and stir. add as needed until you reach desired shade
add in Rice Krispies and mix thoroughly. add more food coloring if cereal is not blue enough.
spread the mixture into a greased pan with a greased spatula.
allow mixture to cool (about 30 minutes)
use fish/shark shaped cookie cutters to cut in shapes
trim bottom fin and add it to dorsal fin
add candy eye in place
put red writing gel around shark mouth
serve & enjoy!