The light up energon cubes are awesome, especially at night. A good prop for displays.
Speaking of which, I finally found one of those little vinyl Daniel in Exo-suit toys at the last TFCon and he makes a great prop for the new Classics.
Finally, on the topic of displays, check out:
http://forums.tformers.com/talk/inde...howtopic=91920
For some amazing printable Ark wall plates to display with your Autobots (and Nemesis walls for the Decepticons). You can even print up a Teletran one!