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Examples of Fleur-de Leis stocks:

 

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Looking back through old Colt catalogs, as far as 1905, the name Fleur De Lies is not used by Colt. They are referred to as "Select Walnut Stocks, Finely Checked" in a 1904 ad introducing the Officers model. After that, they are referred to as just "Checked Walnut Stocks" in all the catalogs I looked at from 1905 through the mid 20's when the style was discontinued. The Black rubber stocks are only referred to as "Rubber Stocks". It seems to be a made up name that has stuck, just like 45 Long Colt.

Maybe collectors invented the term to separate them from the "non-fleur-de-lis" wood checkered ones!