Here in the state of New South Wales in Australia we have to have plates front and back. They used to be ugly black on yellow but for some time now other varieties have also been available. We can also choose our own letters and numbers. Have a look at:
http://www.rta.nsw.gov.au/nd/nd4/ndconfig.nd/OLPS/pgSpecialPlates

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107.023: 350SLC, 3-speed auto, icon gold, parchment MBtex (sold 2012 after 29 years ownership).
107.026: 500SLC, 4-speed auto, thistle green, green velour.
124.090: 300TE, 4-speed auto, arctic white, cream-beige MBtex.
201.028: 190E 2.3 Sportline, 5-speed manual, arctic white, blue leather.
201.028: 190E 2.3, 4-speed auto, blue-black, grey MBtex.
201.034: 190E 2.3-16, 5-speed manual, blue-black, black leather.