From Dream Frequency:
Hundreds of free mobile wallpapers. Images include beautiful models, landscapes, seascapes, movie posters, your favorite brand logos, wild animals, photography, conceptual art, cityscapes, satellite images and more.
For cellphones and smartphones. Sizes are QCIF 144*176 pixel size for cellphones and QVGA 320*240px for phones plus a few Apple iPhone 640*960px wallpapers.