Dragons, like those on Anne McCaffery's sci-fi fantasy covers!
Greys and browns in variegated shades for use in realistic applique of animals. Same thing in whites and creams.
Whole grain fabrics (wheat, corn, rice, oats, and others ) with stalks for farm/ranch scenes.
Lady construction workers - I have a daughter in construction management who is working on light rail projects. Try finding something modern showing light rail!
Skylines of famous cities
Stock Exchange symbols - ie bulls, bears, ticker tape, NASDAQ and other electronic equipment