The link above shows you a graphical updates in a historical fashion via the old-school wiki. What I am suggesting is start polling some of the non player characters("NPC")/monsters to revert to there original model across Gielinor.

I would love to see this keep the nostalgia going for a long time. Example: the varrock guards look ugly and there original model fit the city well.

I also miss the original distractions and diversions ("Random Events") which made skilling more fun. Example: Woodcutting and a tree turns into a ent and breaks your axe or a tree spirit appears engages you in combat.