My husband made these for our son's Indiana Jones birthday party. He took a ceramic Halloween skull, added gray faux fur, glass bead eyes, and sculpted brows and noses from Sculpey. Then he painted everything a grayish color. The skull measures about 4.5" tall and about 6" wide.
We actually served Jello-O brains to our guests in these. I made the jiggler recipe with red Jell-O, placed a Ziploc bag of ice into each, then inserted a clear plastic tumbler cup full of the "brains" so that it rested at the right level in the skull.
These are not dishwasher or microwave safe. Use a slightly damp sponge for spot cleaning only. The brows, eyes, and noses are delicate so handle carefully. If any piece becomes detached, it can be put back on using super glue or Liquid Nails.