How to insert an image in a Zotero Note (works with Firefox and Chrome; I have not tested it in Safari)
Pinterest is Open URL-compliant and has a browser translater/icon that will download the Pinterest item you are looking at as a webpage; alternatively you could save it as a webpage. Both methods capture different elements, and neither is comprehensive. I think I'd give the preference to saving it as a webpage, but you will need to carefully add in bibliographic details - which adds to the complexity (author field options are author, contributor, translator -- collector is noticably missing!)... [more later - I need to fiddle with Pinterest a bit more - if you have ideas, please comment!]
5/2013 update: Pinterest has expanded its metadata; I will do some testing on this soon!