PhotoBooth is packed with tons of cool effects although once you've been through them a million times like I have, you do get bored.
Fortunately, programs like AlterEgo mean that you can continue having fun with PhotoBooth long after the initial novelty has worn off. In the full version, there are 36 "Egos" in AlterEgo that change your image radically although in this version you only get 6 for free initially and the rest you have to purchase. Unfortunately, none of them are particularly impressive and leave you with little motivation to upgrade.
The 6 free egos are Bitter Glow, Black Hole, Carving Block, Megapixelated Psychotic and Zebra, none of which add anything particular radical to the effects you get with PhotoBooth by default. A look at the online gallery shows that those egos that you can purchase aren't much more exciting either. A few of the more original ones look interesting but probably not worth the upgrade.
Unless you're a real PhotoBooth freak, you probably won't find many exciting effects in AlterEgo to spice up your iSight.
