Martha Sue Harris
Here is an imaginary world where plants and their roots resemble demonic and mutated looking creatures. Along with some great drawings and paintings of these odd things, there are also some great fabric sculptures of them, very unique.

Boris Artzybasheff
I discovered the art of Boris in an older issue of Blab. I was amazed at the reinterpretation of the human body as factory and war machines. He made many illustrations for Time magazine. His trademark seems to have been giving human like appearances to vehicles and other machinery.

2nd Gallery
3rd Gallery
There's some giant anti Nazi drawings posted here.
Single Image

Nemo Ramjet
This gallery contains a great selection of unique looking creatures and very mutated humans. Nemo appears to have a wide range of styles but my favorite is where he appears influenced by Moebius. Click on the numbers below to see a few of my favorite works from the site.

1
2
3

And don't miss his sketch pages, there's some really strange beasts like this in there.

Cameron Forsley
Cameron's artwork combines a very interesting and warped style of the human figure alongside bizarre beasts of all shapes and sizes.

Additional galleries of Cameron's art can be found here and here.

Rindou Himawari
Looking through this website I got the same feeling I did when I was a kid flipping through those old Dungeons and Dragons monster guides that show you profile views of the monsters. There's a ton of incredibly inventive and colorful creatures to be found here. The site isn't in English but is easy enough to navigate through. Don't miss this page full of weird monsters. If you enjoy bizarre Asian styled monster art like this, be sure to check out this gallery of Yokai inspired creatures.

Otake Shigeo's "Secrets of Plant Worms House"
Shigeo is one of the most interesting artists I've discovered this year. The paintings are filled with very alien looking plant life and creatures. Some of the work reminds me of Jim Woodring, Remedios Varo and Leonora Carrington.

José Guadalupe Posada
Posada was a Mexican illustrator who had a tendency to draw a lot of skeletons. His imagery is often filled with very dark scenes of disaster, torture and demonic creatures attacking people. He also made a wide variety of political cartoons which often included the previously mentioned types of imagery. Here is a link to my favorite work of his which you can see a part of in the image linking to one of his larger online galleries.

2nd Gallery
3rd Gallery