The Thrawn series, the Mara Jade stories, and the Hand Of Judgement stories would make excellent films (all Zahn).
If only Lucas had handed the reins of the franchise over to others back in the '90s, when Hamill, Fisher, and Ford were still young enough to play the characters as they were written in those books. But noooooooo, we had to get over a decade of godawful acting, CG overload, and revisionism instead.