FLCL, Shoujo Kakumei Utena Recommendations
People usually use Eva as an example of symbolism, but when it comes down to it, Eva's imagery is usually consistent with the rules of the world it takes place in. Utena and FLCL take symbolism to another level. These are both shows where the environment does not play by the rules of the plot. You don't know what you're going to see next with these shows. Utena and FLCL's style is true mind screw.
Both shows have a lot of strange symbolism, and make unusual use of animation and art to do it. Each involves sexual innuendo and rather bizarre but entertaining comedy.