Most free http proxies won't because of the headers they send, but you might be able to with a free socks, but that's a whole other kettle of fish.
[url width=300 height=304]http://www.g20style.com/images/img_header.jpg[/url]
= NO
[url width=360 height=360]http://www.selftrading.co.uk/files/images/Men_s_Combed_Socks.preview.jpg[/url]
= POSSIBLY
[url width=500 height=375]http://photo.hihenry.com/photo-070904143007.jpg[/url]
= YUM