Many people give away free accounts in different places on the internet. Runescape related forums are a great place to start looking, you can search for "tosses" which are big giveaways of Runescape accounts. When you are playing Runescape you can use the shout box in order to get what you want, all the high level players will respond and give you a free Runescape account if they have an extra account or two they no longer use.
As I said, this is a great way of finding accounts but don't spend to long looking for accounts because you may be missing out on all sorts of in game events. These events can make you millions of gold and high level items. Zezima might have a large number of accounts to give away. This Runescape player likes to give a lot of new players some help. Free Runescape accounts is what all players want when they start playing because the game is very hard and long if you do not get a head start. However if you do get a head start then you must make sure that you know how the free Runescape account got to that state of high level.
Another way is to get a Runescape account from a distribution site, That's where this site comes in handy. I have big databases full of accounts. And instead of paying for them you can actually get them for free, all you have to do is fill out a simple and free offer.