BBC Choice morphed into BBC3 on 9th February 2003. The idents featured a big blue 3D 'THREE', surrounded by a family of 'blobs', created by Aardman Animations. The audio for each ident came from the BBC's massive sound archive, taken out of context to provide the blobs' voices.
The channel logo in the bottom right corner of the screen was changed from white to blue in 2005.
From our YouTube channel, a compilation of BBC3 idents from 2003-2008.