www.filesmelt.com can host any image you throw at it, and any other file types.

Here is a cucumber for good measure hosted on filesmelt , and underneath it is a gigantice 17+ mb image link using filesmelt

http://filesmelt.com/dl/fractalredwhiteblack1.png


As to how long the hosted content stays hosted, I don't know, but filesmelt is a good way to share large images and your files