Don't get me wrong, I like Cthulhu stuff. I've run and played numerous Call of Cthulhu games. It just seems lately that many of the OSR fantasy games are defaulting to tentacle monsters, starspawn, etc. Of course, Cthulhu is now public domain and at least initially, new to the fantasy genre.
It's still really cool, in moderation. However, it's getting to the point that many "standard" monsters are getting ignored. On one hand, tentacle monsters are inherently creepy. On the other, if every other adventure a group plays has them, they become kind of lame.
Monsters I'd like to see used more: demons, angels, plant-based stuff like assassin vines and treants, werewolves, and the various types of fae. A good OSR adventure based in a faerie wood would be fantastic, actually.