David Gatti may have created only two covers for Raymond E. Feists books, one of which was never used, but the one that was used is probably the most famous cover, it was the cover for the original US Doubleday, Hardback edition of Magician, back in 1982. 

Silverthorn

This is the original cover designed by David Gatti for the US Doubleday Hardback edition of Silverthorn, but was never used