My door trim has grease marks from getting muck on my hands (more likely my arm) from the bike chain. Once I've got the towbar and bike carrier fitted, I'll clean them off - if I do it now, I'll probably put even bigger ones on to compensate.
As for the floor, I'm rather disappointed with my Panda - there's a distinct wear mark where my left heel sits on the carpet. It's already worn through the fluffy top and working on the tough inner weave. The only way to fix this would be to drop in loose, rubber mats, and those things never stay in place. Seeing Fiat have provided a rubber/plastic insert in the driver's footwell, it beggars belief that they've made it so small it's essentially useless.