Themes support is one if the major features that jailbreaking your iPhone supports. Winterboard enables you to choose an array of beautifully designed themes.
Geohot’s jailbreak for iPhone 3GS was not playing well with Winterboard. Cydia’s Saurik released a revised mobilesubstrate which enables themes support the way we are all used to!
Launch Cydia and Click in refresh. You will find mobilesubstrate. Install it, reboot your iPhone and choose a lovely theme!

A new application called Theme Builder has been released by the developer of MxTube Application. This application allows the creation of themes on the iphone itself! The application gives you option to edit an existing theme or creating a new SummerBoard Theme. The application has a really wonderful GUI. The image packages with a number of icons, wallpaper etc can be found on installer or images can be added manually to make cool themes. You can also preview the theme you make but the icons preview is expected …