Cool or silly undead army idea: Frankenstein-themed zombie army

Necromancer riding a big rotting rat with bat wings grafted on. His cloak is man of skins stitched together (like the one on the 40k haemonculus)

Instead of crypt horrors, big frankenstein zombies with several bodies merged together crudely with implements for hands

Lots of zombies for baseline troops, some converted to be amalgams of parts stitched together.

Banners would feature lightning motifs striking a zombified head with bolts at the neck, and glowing eyes

Corpse carts would feature necromantic acolytes with butcher cleavers and lots of surgical looking implements on their waist