Yeah, all we really learned about Lily came from memories, but.... According to the Order of the Phoenix, Lily had long dark red hair and green almond-shaped eyes, just like Harry; James had hazel eyes and black messy hair; and Ginny has brown eyes and long, bright red hair. So Harry and Ginny look just like James and Lily... with their eyes swapped *g* Which I think was a deliberate choice on JKR's part.
My other crack theory is that in Voldemort's first war he systematically killed as many older wizards and witches as possible. Harry's parents died at 20, but he didn't have one grandparent? We never hear about Weasley grandparents. I think the only one in canon is Neville's. The unusual thing about the Order of the Phoenix and Dumbledore's Army is that both were made up of young and untrained/unskilled wizards.
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My other crack theory is that in Voldemort's first war he systematically killed as many older wizards and witches as possible. Harry's parents died at 20, but he didn't have one grandparent? We never hear about Weasley grandparents. I think the only one in canon is Neville's. The unusual thing about the Order of the Phoenix and Dumbledore's Army is that both were made up of young and untrained/unskilled wizards.