CustomizeMii is a 100% legal custom Channel creator for the Wii.

Changes:

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!)

http://wiibrew.org/wiki/CustomizeMii