Create Your Own Ajax Loading Gif

The ajaxload site makes it very easy to create those Ajax 'loading' gifs, it is a 3 step process

1. Select the type of indicator you want
   
2. Enter the background code color you want (tick "Transparent background" if you don't want one
   
3. Enter the foreground code color you want

Press "Generate it"

Here are the different types of Gifs available:
Circle ball
Indicator
Kit
Arrows
Indicator Big
Snake
Bouncing ball
Bar
Bar
Bar
Circling ball
Hypnotize
Wheel
Expanding Circle
Radar
Refresh
Flower
Squares
Circle Thickbox
Roller
Wheel Throbber
Smallwait
D Rotation
Indicator lite
Squares Circle
Big Snake
Big Circle ball