SetDirectory["/Library/Application Support/Apple/iChat Icons/Planets"];
names = FileNames[]
Output:
{"Earth (Americas).gif", "Earth and Moon.gif", "Earth (Australasia).gif", "Earth (Clouds).gif", "Extrasolar Giant.gif", "Jupiter.gif", "Mars.gif", "Mercury.gif", "Neptune.gif", "Pluto and Charon.gif", "Saturn.gif", "Uranus.gif", "Venus.gif"}
Now just use import:
Import /@ names