Splatter
is a texture of it's own, as well as a starting point for other textures.
Orange peel
is actually a tiny splatter and has become very common. It can be sprayed on both walls and ceilings, as well as painted however you like. It can be varied in it's application from fine to course. A medium application is shown below.
Knockdown
is created by applying a splatter and then using a flat knife to "knock down" the points. Knockdown texture makes a nice modern ceiling or wall finish. It can be varied from a small, fine pattern to a larger, dragged-together look called "Spanish Lace" or "Mediterranean". A well done knockdown texture can increase your home's value.