Anyhow, I have done a bit of reading about this, and it seems that pinning anything other than a creation of your own is in fact deemed to be a breach of copyright, and.....the creator could claim compensation from you!! Makes a bit of a mockery of the Pinterest site really, and makes me sad that we can't just all share and enjoy each other's creations, while always crediting them of course to their creator.
I am going to shut down my Pinterest account, and just blog hop in future for inspiration. Please be careful. A stern e-mail from Pinterest is bad enough......you really don't want people claiming compensation from you.