I'm very interested to see how you've done it with plastic boxes. I use plastic crates that are open, and they still get to hot sometimes (especially when stacked).
You can upload the pictures to photobucket (
www.photobucket.com). There will be a "direct link" to each image on photobucket, which you can use to include it in your post by putting the link inside of image tags
For example, if you write:
[img]http://i374.photobucket.com/albums/oo183/hikari_miyako/babypenguin.jpg[/img]
It will show up like this:
Sorry, I didn't have any images handy, I just picked one from the photobucket browse page.