I have an opinion that a lot of people probably don't agree with...
When rares first came into the game, pretty much everyone had them. The reason they went up in price is because the people who had them either dropped them because they were worthless, or quit.
So I think Jagex should do it the same way. Give each accouny either a Christmas Cracker, Santa Hat, Pumpkin, Easter Egg, which ever event they do.
What's your opinion on my opinion?
EDIT: This would not ruin the game or economy. If you think this ruins the game or economy please elaborate on how.. They are only cosmetic items + have no bonuses (that I know of). So if you believe these would ruin the game.. Take out 3rd age or barrows first. As those give some of the best stats and could be considered rare and overpowered.