Battlefield 2 costum maps, can be  found here.

    Lets start with the totalbf2 mapteam, they made 3 mappacks.

     Try them out!!

Other great sources

Planet Battlefield

WCCSQUAD MAPS

BF2-Maps

Alpha9s costum maps

One single map called  Basra Edge, yes the one from Desert Combat!

INFO

Download  70 mb

Wake Island air show

Battlefield dogs maps, remakes of classic BF42&DC maps

X-07 MAPPACK [LAN]

Hue, remake of a Battlefield Vietnam map

Download and Info

BF-Nation.de Multiplayer Map Pack