Alright! I narrowed it down to these 3...

I love this one because Dashie and I both associate dreams with clouds, and the swirl of color represents Dream's artistic ability.

This one I love because the brush is creating the dreamcatcher, which represents how Dream creates her OWN dreams and makes them come true.

And finally, this one. I love this because of (once again) the rainbow. I feel like, in this one, the whole thing represents Dream's creativity as well as her bright personality.

And now, ladies and gentlemen, you choose. Which of these lovely icons will become Diamond Dream's cutie mark? The choice is yours! Vote for the one you choose by leaving an inline comment on the image.

Thanks guys!