I love creature designs, especially the ones for movies. Austin introduced me to Iain McCaig's artbook,
Shadowline, which is extremely inspirational to me. McCaig is probably best known for his work on the "Star Wars" prequels, but he's done a ton of stuff for movies in the science fiction and fantasy genre.
Monsters and creatures will always have a special place in anyone who loves cinema, animation, comics, and anything cool. I like to add cracks , textures, and horrific elements to pump up the gross factor, and the sense that you can actually touch these things (and it would not be very pleasant to do so).

These guys have a calamari-like and even "rectal" quality to them - two things I don't find very pleasant.