I would want a volleyball net for the purple ball and some other fun activities like that. Maybe a forklift?
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Some great ideas I've seen lots of people want are library, personal quarters, gun-range. Glimmer/loot gambling was an interesting one that stood out to me. Another great one is changing face paint & hair when you feel like going for a different look. Personally, I'd also like to go down into the hangar and actually check out my ship.