https://www.duelarena.konami.com/en/st0/duelapp/duel/effect/fullScreen/exz.swf
https://www.duelarena.konami.com/en/st0/duelapp/duel/effect/fullScreen/g_disaster_leo.swf
https://www.duelarena.konami.com/en/st0/duelapp/duel/effect/fullScreen/g_puppet_leo.swf

http://duelarena.vbulletin.net/forum/english/tavern-aa/randomness/53691-game-cover-pictures-backgrounds?pp=53911
(read Bread's responses in the thread)