The only thing consistent through the years for skittles has been it's lettering. There is no other logo, really. The rainbow & design background changes, but the letters stay the same. They are modular & very recognizable.

Skittles New Logo

London designer and designers' favorite Miles Newlyn worked with Dragon Rouge to create a new logo for the Skittles brand name of candies.

Skittles logo...

Skittles logo...