Here is a ROM hack for Hogan's Alley which changes all the graphics in the game. Instead of shooting criminals, you need to shoot all the garden pests that appear on the screen!
Hogan's Alley (World).nes - NOINTRO
CRC32: 9D39585B
MD5: AA78965764353F321B4BCE9221128909
SHA-1: A70F09A3163B8C967C03DB8C20005C828836CC4D
SHA-256: 4D03C016087976A4E334F0E23F58812517128BB8F517D7ADB6B91B360B7885C7