The idea is that, coming out of one of the seas on Saturn's moon Titan, is a tall and large biological tower. It has dark brown "skin" on it, with various holes covering its surface. Occasionally goop will pour out of it, which falls into the ocean. The goo is basic cellular life, which spreads into the seas. Eventually more complex cellular life is produced by the tower. Later "seeds" come out of the tower, and grow into plant life. As time goes on "pods" are shot out into the sea and the land, which release various animals. Eventually the tower "dies" and collapses. Note that all life is alien in nature.
The twist I have planned is that is a colonization tool by aliens, meant to be the first colonization phase. The second phase, which is when the aliens arrive to colonize it, hasn't happened yet.
What do you guys think of this idea?
EDIT: I've changed the name of the post to clear up confusion. Apologies to those who might have been confused.
I write stuff. Yipee.