Simply considering the valence orbitals without hybridization and placing them all on one axis is not very helpful in describing the geometries compounds adopt. Pauling's theory of hybridzation allowed mixing of the s and p orbitals to form orbtials of mixed character.
One s orbital + three p orbitals
Taken from http://www.headroyce.org/~sglogover/Resources/Resources.html
One s orbital + two p orbitals (one p orbital left over)
Taken from http://library.tedankara.k12.tr/chemistry/vol3/Hybridization%20in%20molecules%20containing%20multi%20bonds/z87.htm
One s orbital + one p orbital (two p orbitals left over)
Taken from http://wps.prenhall.com/wps/media/objects/724/741576/chapter_01.html