The bone color choice was a happy little accident. I lacked a dedicated color for it in the paint set I had, so I mixed an old (color-separated) rakarth flesh Citadel paint I found with some matt white and daemonic yellow from my The Army Painter set.
I never really considered basing before (my frame of reference for miniatures has generally been the old 3.5e era D&D pre-painted minis which had neutral black bases), but the third miniature I painted had a sculpted base to paint and that did end up looking really nice. Haven't posted that one because I simply followed a painting guide there.
The bases here came pre-attached (or rather, they're likely just a single mold), otherwise I suppose a tile floor would work well for these. 🤔 I'll have to think about what else could work here.