I pulled a URL from Polyvore embed code and image is relatively small. I havn’t found anything larger, if it is available.
My items I put out average original size each about 1000×800 I downsize them from originals which may be 3000×2400.
It is a interesting collage thing, and if you had a large library can build some interesting pieces, but not so different from programs likr Printshop from Broderbund which use clipart etc. The key here is they support transparency to some extent.
Images are too small even to create a card here. Dimensions: 500 × 456
Interesting that the target image incudes “polyvore.com” at bottom of image, no copyright though. I cropped that off. Yuh Think? My images all.