Here is my small contribution :
$rat.png in "characters"
$rat_down.png in "characters"
[/url]
$bigrat.png in "characters"
$bigrat_down.png in "characters"
rats.png in "faces"
Then create the 2 monsters in the database (there is already a rat in 5th position)
What ? you think it looks like pokemons ? well , yes , this is 2 pokemons . I am sorry , i don't remember where i take the srpites , the faces are coming from the "spritedatabase" . i have only made the _down sprites .