The blob.

Intrigued by the amorphous blob you reach out and touch it. As you do everything else vanishes and a vague outline still remains. Reaching out as your hand rises a huge selection of feet appear from normal cute girly feet to muscular manly ones to the more exotic hooves and cat paws. Raising your hands further gives the same style of options for legs, then private parts, stomach area, chests both female and male, arms, finishing with heads. Further as you move your hand left and right the size changes with an indicator above it listing the height, once you are on the sliding scale lifting up and down instead changes the weight indicator. It seems your choice is anything from 50 to 600 lbs and from 3 to 9 feet tall. The only thing it won't allow you to do is anything that completely doesn't fit structurally, so no giant heads on tiny bodies or the like, and no 600 lbs 3 foot balls of fat, but for the most part it seems anything goes.

Looking it all over you start looking at a few things and as you lock in some of the options you notice some of the others vanish as well so while you seem able to make anything there must be some restrictions that you can't quite figure out. You play with the options for a while before some things seem to start to fit together.