Here are some great links to patches by category. Definitely worth bookmarking if you like embroidered iron-on patches.

LARGE PATCHES
BIKER PATCHES
SCUBA PATCHES PATCHES
US FLAG PATCHES
INTERNATIONAL FLAG PATCHES
STATE FLAG PATCHES
MILITARY PATCHES
IRISH PATCHES
MORE FLAG PATCHES
RESCUE PATCHES
PEACE SIGN PATCHES
PIRATE PATCHES
RELIGIOUS PATCHES
POW-MIA PATCHES
CONFEDERATE FLAG PATCHES
ROAD SIGN PATCHES
EAGLE PATCHES
SKULL PATCHES