Ouran Koukou Host Club, Mawaru Penguindrum Recommendations
Comedy, drama, bishounen, bright colors and nice animation. You need to have a weird sense of humor to appreciate them. Mawaru is a bit more naughty.
Same art style, same kind of humor, same surrealistic tendencies (although Mawaru Penguindrum goes waaay further down that route), same heavy uses of symbolism, same avantgarde feeling when watching both, both present way more depth tahn it looks and both make heavy use of implicit taboo relationships.
A lot of similarities, Mawaru Penguindrum is a better show overall, and it gets more dramatic (and harder to follow) than Ouran Koukou Host Club at it's end, but if you liked one you will definetly like the other.