What do marine invertebrates look like?

There are so many species of marine invertebrates that it would be impossible to describe them all here.  However, in general, marine invertebrates tend to be soft-bodied.  Some have shells and some have an inner shell, although many are shell-less.  Many marine invertebrates tend to be camouflaged with their surroundings, and it is common to find brightly colored creatures in the depths of the ocean.