All the 4th edition Dragons were designed by Trish Morrison, with riders by various other sculptors. Initially they were all metal, but following the release of the plastic Talisman Dragon, the wings from that were used.
4th Edition Dragons
Orc2: Orc Shaman on War Wyvern
Zombie Dragon
Prince Imrik, Lord of Dragons
Azhag the Slaughterer
Talisman Dragon
Rakarth the Beastlord on Black Dragon
Egrimm van Horstmann on Baudros, Chaos Dragon
Forest Dragon