I know the devs have said they plan in the future portrait packs and the like. I think that's great, but personally I would really love to see a bunch more ship packs. I'd pay good money for them! I don't know how much more/less complicated they are to produce than species packs so maybe it's not feasible. But if it is I think the interest is definitely out there. Maybe an alternate pack for each species type, or even some kind of special event tied design set that opens up after a new quest line that they would introduce with the DLC.
However you do it, please do it!
However you do it, please do it!