This section may really offend a compulsive Leela fan, a.k.a. "Leela Lover". Here you can see some pictures that "enhance the alien nature" of Leela, especially on the upper half of her body. If you've got more stuff we can stick in this section, feel free to submit it!
Mad Magazine (Germany)
This issue used the same joke both in the cover and in an interior page. Here's both.
"Futuredrama" offers an alternative to Leela's alien anatomy, both in the regions explored by Mad and in others... Leela really lost her head in here.
More weird stuff
This picture was posted at The Hip Joint.