sounds like possibly Peripatus, which are really cool. They are kind of living fossils. There's an article about them on this page http://soilbugs.massey.ac.nz/onychophora.php but the pics aren't very blue, I've seen really blue ones, depends on what part of the country you are in
This is the bluest type:
cool huh? Image from http://www.rodmorris.co.nz/insect_gallery1.htm by Rod Morris