A simple way to create blood splatter on any of your desserts is to every so slightly water down some red food gel. You could also use red airbrush liquid if you have that on had. Often times I add drops of food gel onto a paint pallet and let them dry to water color on cookies. If you have this on had, you could also add water to those dried drops of food get and follow this same splatter technique.
I created the bats by airbrushing wafer paper and sprinkling edible glitter on top. Once it was dry, I punched out the bat pieces with a paper puncher from the craft store. This is such a fun way to get little shapes to glue on with icing onto your cookies.
simple by Crystal Kluge