Difficult to obfuscate IP's. I don't know of a way. :/
If you want to encrypt the packets themselves I think the site/server you're visiting has to support encryption as well.
Ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fhtagn!
"The sky was the color of a TV tuned to a dead station" - Neuromancer
(And FYI, that's not the case, just an example 
)
