wallpaper plugin !

Hi,

Can someone help me to find out what plugin or theme those site use :
allwalls.net
asia-trip.info
citydestinations.org
foundwalls.com
freewalls.org
iphone.wallpapersus.com
nationalcapitals.net
topwalls.net
topworldcities.net
travelimg.org
wallpapersget.com
wallpapersshop.net
wallpapersus.com
wallsforpc.com

Many thanks in advance

PS: need a plugin like this for a ONG website