Where to find art assets

I am working on various game software components and would like to use real art assets (e.g. textures, models, animations), written by standard tools (e.g. Maya, 3D Studio Max) to gain experience. I am not an artist and do not have time (nor the talent, likely) to learn a new trade and huge suite of software. Is there an online resource where artists post their work for free public consumption? I will only be using this for personal reasons. Thanks