A Bucket of Blood

Suggestions:

The Monster of Camp Sunshine or How I Learned to Stop Worrying and Love Nature Fire Serpent Door Nudist Colony of the Dead He Lives in the Woods

Walter Paisley, a busboy at a cappuccino bar called the Jabberjaw, is praised as a genius after he kills his landlady's cat and covers it in plaster. Pressured to produce more work, he goes after bigger subjects.