Be cool if users can assign a picture to be lightly overlaid behind their posts/replies. (almost like a watermark image)

petrol:

I was thinking what if we have an option to decorate the forums so you could make the forums have a wallpaper, like Butterflys lol

haha i could have pretty butterflies all over my screen! :D

What about having Movies as the background because we have HTML5 now! So you can put whole movies of unicorns and rainbows and unicorns vomiting rainbows and more rainbows and double rainbows! Ah, That's the life.

Um NO.

But if you do want something, Drag this link into your bookmarks bar and click it when you want a different background.
EDIT: doesn't matter the forum doesn't support links... >_>
But if you know how, make a bookmark of any webpage.
Then edit the URL of the bookmark to this:javascript:(function(){document.body.style.backgroundImage="url(http://rainbowdivider.com/images/dividers/bar3xxx.gif)"})()

yeah useless but cool +100

what about a background for the actual powder toy? Or would that mess up elements? IDK.

@Schiffty99
it probably bwouldnt mess up element, but you may not be able to see some of them because of the color. How would you see Photons on a white background?