— Rhindon: Of course dropbox can hotlink images.
Check my current forum signature, the images are hosted on my public dropbox account and displayed through an img tag.
Just make sure to use the public link to the images as for any kind of dropbox public sharing.
As for hotlink :
Clicking this image takes you to the image itself.
Just be sure to use first a url tag and then an img tag.
[url=http://bit.ly/1r6arz1][img]http://bit.ly/1r6arz1[/img][/url][/code:z26tub8r]