NOTE:  The Legolady.jpg construction pictured here was not my creation - 
it was an item up for sale on ebay - asking price was $11,000.00.  I don't 
know who the artist was, but I love the pic, and had to hold on to it after 
the auction ended.

Lugnet has a Mosaic Maker program that can facilitate designs like these ... 
http://www.lugnet.com/cad/mosaic