By far the most unique and the best selling theme that we have done for the BlackBerry here at MobiMadness is the Corkboard theme. The original concept was easy, take something that has a lot of distinct items on it (post-it notes, pictures, pieces of paper, etc.) and convert it into a theme.
The actual implementation of the concept was a huge undertaking though and from start to finish, took about two months with 90% of that time dedicated to perfecting the icons.
Since its original release in October 2008, the theme has underwent a few minor changes for OS 4.5 and a few major changes to take advantage of the higher resolutions of the new phones.