Now that the old Star Wars Expanded Universe is officially defunct, it seems highly unlikely that we'll ever get an actual minifig of fan-favorite Grand Admiral Thrawn. Like many people, however, I saw the possibility for a satisfying "purist" custom version of the character (overlooking the rank pips, of course) when the exclusive Yularen figure came out last year. Since then I've since seen numerous variations on this idea, but I thought I'd try my own hand at it. Thrawn's head is Cad Bane, while Pellaeon is Yularen's head on the Star Destroyer captain's body from 75055. I wanted the design of the uniforms to match, and these do! The rest of the vignette is very minimalist, with a window borrowed from 75093. (And yes, I realize that the gold epaulets on Thrawn are not mentioned in the novels, and that there is some debate about gloves. I decided to use the original novel covers as my inspiration.)
EDIT: Updated with official Thrawn minifigure plus black boots: