A bounty hunter spin off would be pretty good. Boba Fett, IG-88, 4-Lom, Zuckas, Dengar, Bossk, all their interactions with the Empire, the Hutts and Solo/Chewie.
Solo was an imperial pilot, he refuses to carry out an order to skin Chewie and a bunch of slave Wookie children. Pretty sure that's the start of their relationship and the beginning of his hatred for the Empire.