,,, and the final result, looks a lot like the first picture. You can lower the blob by making value 1 of the color-math 2 a litlle darker, changing the displacement  will have some influence on the bottom shape, you can change that by changing the y -value of the P-node. Instead of the simple_color node also image_maps can be used offcourse. I haven't had the intension to make a scientific approach to  the problem, but more to make a bag of tricks to make it look like gravity is involved. Wanna see some usefull application? Check in tomorow for an explication of fat-distribution maps. But beware!: nudity will be involved

-How can you improve things when you don't make mistakes?