A children's model of a retro-designed Fiat 500 and the newly released retro-design of the famous Fiat 500 - better know as Fiat Cinque Cento - are seen at the Frankfurt International Auto Show IAA in Frankfurt September 11, 2007. The Frankfurt motor show will be open to the public from September 13 to 23. Green technology and lower fuel consumption will be a big theme at the largest and most prestigious auto show in the world this year. [Reuters]