Without getting everyone all upset, I'd rather just start a discussion about some possible answers. It seems like using images that you buy/own could work, or creating all your own images. Maybe marketers/designers could start putting together some packages of pictures/psd's that would be able to be edited but would work for engaging people on Pinterest.
I don't know...just some thoughts. Any other ideas? I think Pinterest could be a great traffic source for certain kinds of sites, but I'm still looking for some answers before really utilizing it.