CustomizeMii is a custom channel creator for the Wii.
The .NET Framework 2.0 is required to run this application!
There is also a mono version which runs under Linux / Mac OS X (Requires the mono framework!)
For any further information, see:
http://customizemii.googlecode.comPlease use the Issue Tracker there to report any occuring bugs.
Thanks to icefire / Xuzz for the basic idea of this Application!
Download: http://code.google.com/p/customizemii/downloads/list(Please just link to this site instead of mirroring the archive, thanks!)

Quote:
Changelog:Version 2.3- Fixed bug when extracting icon images
- Added ability to change the startup IOS (IOS used to launch the title)
- Added support for Korean channel title (reading and writing)
- Added TPL width and height to Banner and Icon list
- Added ability to replace multiple TPLs at once (images must have the same filename!)