Super easy DIY using dollar store plastic skulls.
Start with a plastic skull. I found mine at the dollar store, but you can find at Michaels, Party City, sometimes CVS, or Target.
Using a knife, cut a circle (about 3in diameter). Place a small vase inside (or just fill skeleton with water if it will hold water without leaking).
Add flowers. I used a grocery store arrangement and filled in with pieces of our outdoor mums. The perfect Halloween table decor!