For Keth? Well beyond any dreams from her soul shards past, it would be dwelling on projects, plans, Nexus and Sinclair - very 'creating' dreams.
Dreams about the school and craft-trade town she wants to build someday - where could she build it, what it will look like, when she has the resources/allies/pull to build, attract students and defend it. New business deals, new songs and music in general, new artifacts to craft, what knowledge and spell works she needs to track next - she's got some great new artifacts to work on after the Luna adventure is over. Sijin, her trade caravan contacts, and other ideas rattling around in hear head.
Very creating/building dreams. Nightmares would likely focus on twisted versions of the ame. How those could go wrong - artifacts shattering at critical moments, her school in flames, her students dead, losing her voice so she can't sing, Sinclair telling her everything was some Raksha prank and/or killing her.