How about rental items for newbies?
Say for example:
Newbie Hat
+5 int and dex
upper headgear
5,000z
Newbie Armor
+5 vit
5,000z
Newbie Dagger
+5 str
5,000z
Newbie Shoes
+20 flee and 10 perfect dodge
5,000z
Newbie Cloak
reduces neutral damage taken by 20%
5,000z
Of course only novice can rent these. About the duration, how about 2hours?
Well that's just an idea.
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For "pro" people instead of having them use zeny to rent items, how about using donation coupons? I believe there was someone who said that the server is getting flooded with donation coupons -but yea whatever. Right now I can't think of anything that "pro" people might want or need. Again this is just an idea.