I voted for marble too. We already have chocolate if you want a sweet edible pet, and most Christmas pets have striping anyway (not to mention that pink is, like, really neon), though I'd be okay if it won instead. Floral is just hideous to me. The artwork on all of them is really nice though - marble has some nice transparency and reflective light, and candy has some subtle texturing that actually makes it look sticky.
(Plus, we used to have glass and stone paintbrushes back in the day. Relic fills in for stone, but we still don't have a proper glass paint brush, so this seems fitting.)
I'm hoping they'll do this for all future colors. It makes sense to let the public choose what new colors they want so we don't end up with any duds (swamp gas, anyone?).