Oh, yes. Wormheads. Twin tendrils off head. Females much yum-yum.
Twi'leks (pronounced /'twilɛk/) were an omnivorous humanoid species originating from the planet Ryloth. They tended to eat cultivated molds, fungi, and rycrit meat. Their distinctive features included colorful skin, which varied in pigment from individual to individual, and a pair of shapely prehensile tentacles that grew from the base of their skulls. The tentacles were called lekku, or brain-tails. Twi'leks possessed a fairly standard humanoid vocal structure and were capable of learning most alien languages; however, they usually preferred their native language of Twi'leki, which incorporated subtle movement of the lekku. Twi'lek females were often used as slaves or dancers for their beauty.
Colors held more meaning to a Twi'lek than simple skin tone. Colors aligned a Twi'lek with where on Ryloth they were born. Typically each clan or family was composed of a certain color, various shades thereof. The exceptions of course being the rare colors which were so uncommon, that is was seldom there were even two of them in one family over generations, let alone more than that.
There were various different reasons that Twi'leks were different colors, some of those having to do with elements and other various means. Blue and aqua colored Twi'leks, called Rutian, were born of the Water Doctrin and were known for being peaceful mediators. Those born brown or gray, called Darian, were born of the Earth Doctrin and they were known for being violent warriors.
If a child was born yellow or orange, called Tolian, they were born of the Fire Doctrine and would be known for being headstrong explorers. Green Twi'leks, called Tukian, were born of the Spirit Doctrine and were known for being religious priests. Finally, there were those born with purple and pink skin, called Tyrian, that were born of the Music Doctrine. They were known for being adept in the arts such as music, poetry and dancing and were typically artists. There were also rarer colors such as white, red and black.