Minecraft wiki entry for Ghast, associated text: A ghast up close, shooting a fireball (with the old snowball texture) at the player.
A ghast opens its red eyes when it spits out fireballs (note old "expansion" effect).
Another image of a shooting ghast.
Ghasts (note old snowball texture).
A ghast that is in a nether fortress.
A preview of three ghasts in the soul sand valley.
A spawner programmed to spawn ghasts.
Prior to 1.3, ghasts would slightly expand when shooting a fireball.