Terra Reborn is a third-party metaroom for DS standalone. Unfortunately, since Terra Reborn overlaps the Norn Terrarium for C3, it can not be used in docked worlds. Made by the Terra team, it follows the same theme - a mixture of C1 and C2 graphics - but is slightly larger.
In 2010, Moe released a new version of Terra Reborn for DS which does not overlap the Norn Terrarium, so you can dock your world with C3 or use the C3 In DS Norn Terrarium. Moe's edition overlaps with the Grendel Hideout.