These absolutely make me think of Slimer from Ghostbusters, who is apparently made entirely of ectoplasm. I didn't originally know what he was made of, but it works out great because I had already been referring to it as an ectoplasm manicure in my head.
This manicure was done using only two colors and the watercolor technique. For the base, I used American Apparel Hassid. The green is LCN Fanappleistic. You can find a tutorial for the watercolor method on Beauty Geeks.
If you're not into the "Slimer look," try thinking of these as jellyfish in the deep ocean!
Tomorrow's post is another Halloween design. Till then, have a nice Friday!