http://prometheusrising.wordpress.com/2009/07/17/real-x-head-bigantor-28/

This figure is designed as a tribute to Tetsujin-28, known in the US as Gigantor, one of the original animated giant robots from way back in the late 1960’s. I love the classic muted blue of Gigantor, with its small splashes of color for trim. The yellow 28s are the arm are a nod to the later redesigned T-28, which had big yellow stenciled 28s on its forearms. I had originally airbrushed the eye, but my aim is not true enough yet, and my yellow paint was not the best mix, so I colored back over all of that and hand painted the eye area. Big thanks to my friend Sanjeev for his tip on how to ‘fake’ metallic colors with a thin silver coat over all the non-metallic colors! I had drawn up the ideas for this guy, and managed to paint the entire figure from start to finish in an evening. It still amazes me how much I can get done now with the airbrush! The ‘cape’ is painted to look like T-28’s distinctive jet-pack flame. When I was taking the photos, something dawned on me a well: the gold-mist Bigaro makes a perfect Black Ox stand-in! Watch as Bigantor copies some moves he saw in Transformers: Revenge of the Fallen!

Good stuff.
Here's my own tribute I did awhiles back.