The Replacement Project is an ongoing job of correcting and changing dragon sprites. It was first set up to completely change all dragon sprites that were on the site at the time, which were all from various video games. Because of copyright issues, these had to be taken down, so TJ09 and various others had to come up with new sprites to use on the site.
The project has died down since then, and is mostly used to change sprites which people don't like or which are anatomically inacurate. Possible changes from the project which may take place include the Split hatchling, and a recent change (Jan 1 2012) was made to the Gold Dragons, giving them dimorphism. This section of the forums was recently closed off.