Free jQuery Light Box Gallery
Create thumbnails easily from high-res images, without any distortion, with one line of code.
You can even decide thumbnail dimensions directly from CSS.
Integrates prefectly with any media gallery, even more usefull in dynamic web application when you can face any shape or size.
If you want to add avatars to your application it’s easier to use this plugin to let them fit any size you need then to develop a functionality that help your user to upload avatars of the right size/sizes.