From WizarDru (who DM's our campaign):
Creating an Flash-Card Monster
Flash-Card Monster is a template that can be applied to any creature that can be rendered with a simple line drawing (creatures such as Gibbering Mouthers, Elementals, certain oozes and so forth are excluded, for example). Animals become Beasts, and Humanoids Monstrous Humanoids, but otherwise the type remains unchanged. It retains all the special abilities of the base creature, except as noted here.
Hit dice: Same as base creature +1. Animals that become Beasts have their hit die type increased to d10.
Attacks: A Flash-Card monster retains all the attacks of the base creature, except those which originate from complicated visual attacks or which cannot be simply animated or drawn. A Beholder's eye rays would work, but a Fey creature's charm abilities would not. Any direct physical attack by a grossly-exagerrated physical feature (such as long claws or huge teeth) is increased by +5 to the attack and damage, draws much more blood, and becomes a Wounding attack. The wounding attack will deal 1 point of damage per turn until the defender is healed or stabilized. This damage is cumulative.
Special Attacks: A Flash-Card monster retains all the special attacks of the base creature, except those which originate from complicated visual attacks or which cannot be simply animated or drawn. However Special Quality: An amphisbaena retains all the special qualities of the base creature, but becomes a simplified two-dimensional rendering of itself. It gains the Paper sub-type (2x damage from Fire or Water on a failed save, immune to cold and ink) and has it's AC increased by 2.
Saves: Same as base creature.
Abilities: -4 STR, +4 CHR
CR: As base creature +2