Besides the dick, breast, pussy, and butt seals, there are a wider variety of seals that pertain to certain other body parts.
Lips - the surface this seal is attached to will grow a pair of lips. The sizes range from thin to plump to donut, with more in between.
Eyes - the surface this seal is attached to will grow an eye in the color of your choice! The sizes run the gamut between beady, small, average, big, and anime.
Brain - give anything you want a mind of its own! Works best when you stack it with other seals, and you can even communicate telepathically with it if you are the one wearing the seal.
Arm and leg - these seals are self explanatory.
Belly - give anything you want a big ol’ belly. It’s... not the easiest one to use.