Could give ShaiyaX a try. :P We have done a good amount of customization.
Custom invasion and pvp battlezone maps
Lots of custom mobs and bosses
PvP based GRB
Highrate xp, 1 kill = 60, 1 kill to level after
Decent starting gear
Donator free
EP5 skills
Innovative!! (First server to have custom login screen
)
(I'm not really one to promote on other people's threads, but I guess you asked for ideas.)