In contributing to the great effort to collect Monsters (for Gaming) on Mondays during October, I offer up the following list (all from my Fantasy RPG blog, Valley of the Old Ones), of home-brew monsters that I cooked up during adventure writeups in my setting, devised over the past few months.
The Monstrous Mondays effort was kicked off by Tim Brannan, over at The Other Side Blog.
Filth Prawns (lesser and greater)
Ecology of the Rot Troll
Dark Elves of Werms
Assorted other Horrific Monsters