AllSilhouettes.com is a good spot to find various kind of free vector silhouettes and you can download them for free. Most of the collection of vectors at AllSilhouettes.com are created by a generous designer: Stanislav. Vector graphic is always a powerful format because you can modify it to fit your design needs. You can browse the vector silhouettes in these categories to get start:
Creative arsenal, Creatures, Grunge, Nature, Objects, Ornaments, People and Symbols.
The silhouettes available to download are nearly reaching 3,000 vectors in 45 vector packs. They will absolutely make your design astonished and brilliant! And all for free.
URL: http://all-silhouettes.com/