The DeepIt plug-in has a lot of features of a regular slider. Some of them are auto play, stop on hover, show/hide navigation, bullets list or thumbnails for a navigation, captions with html content. But the main cause for creation of the addons was to give websites' users amazing live-background experience. Use as many layers as you want.
The depth effect is created by superimposing images with transparency (PNG 24 bits). In the plugin, these images are called 'layers' and you can add as many as you want, manage their speed and their direction of movement (right to left or left to right).
To create images'seamless' in photoshop, you can visit this site designshack.co.uk
All Concrete5 add-ons from Myconcretelab