I signed up for the absolutely free space on yahoo geocities. I then ignored the constant ads to go pro for $4.99 a month Or get a domain for a year for $9.99. I created a small webpage that has lots of yahoo pop up and floating banner ads attached to it as my homepage. I made a small directory called images on this space. I store thumbnails and pictures I post to even smaller sites that have no image storage capabilities. I find this site really useful for storing small images for things like freebies. I tried storing small freebies on geopages but the 5Mb/hour bandwidth prevents anything really spectacular.

You can get a small file locker free at renderosity if you start to sell in the marketplace. They give it to you so you can upload items to test but you can also store images.