Dragon Platebody!
Tormented demons should drop the dragon armour pieces, and to make a dragon platebody you need all three pieces and 90 smithing (or similar) making it quite rare (:
Highscores!
It must have been said before, and would get people on the forums a bit more. Working highscores on the forum! So you can see who's got the highest level in a skill and who has the most exp in it! For sure this would be popular and many people would want it (: i dont know how hard this would be to do but it would definately be nice (:
Construction!
Another skill, ofcourse doesnt actually have to be the same as rs, but not many servers have a proper constuction skill. It would be cool to be able to build up a house and have people visit. Though i can see that being very difficult to code (not that i'd know xD) this would be a great attraction for new players too (:
Challenges!
A way for people to get some items, money, exp lamps and what not. Random challenges like run 1000 steps or kill 200 monsters. Stuff like that, and when players complete them they get a reward, eg. 10m cash. Maybe have VIP challenges too, but alot more difficult so they can have another shot at the VIP chest. This would be a great way to get new players started and would most probally attract more players aswell (:
Zaros monster or minigame (or similar)
A new monster or minigame that will give zaros armour, or zammy,sara and guthix bows or other items that people may want but currently cannot get. though all these items would also need to be coded, it could benefit the economy aswell has give people more items to aim towards!
Any feedback on any good points or bad points or maybe anything I can add would be much appreciated (: xx