If you want to have the look and feel of iPhone OS 4 right now, without having to update your iPhone and iPod touch to OS 4, then “iPhone OS 4” theme for Winterboard is the way to go. This theme includes wallpapers for both home screen and the lock screen, along with the new icon for “Calculator” app. This is how it looks like.
A new theme for iPhone has been released, that mimics the look of the yet to be released Windows Phone 7 Series devices. This theme, created by yours truly, is a free download from Cydia, and is available right now for jailbroken iPhone and iPod touch! You can find it under the ModMyi repository.
iPhone Theme Simulator is a neat little tool which enables you to test and design your themes for Winterboard app right on Windows PC or Mac without having to load it up each time on the iPhone just to test it. For those of you who don't know, Winterboard is a free app available in Cydia which enables you to customize the appearance of your jailbroken iPhone in almost anyway you like.