This uses the same premise as selling webpages on your blog but this method would be for a limited time period.

For example, you could rent out one of your webpages to someone for a few months and in that time period they can redirect the page to their site or drop backlinks into it.

Advantages: There's a little less risk involved using this method than permanently selling webpages and the profit margins are equally large. On top of this, it's pretty straight forward to set up - all you need is an agreement between both parties and you're good to go.

Disadvantages: Again, the main issue here is the fact that this is against Google's Webmaster Guidelines; therefore, if you rely on Google search traffic to bring in traffic to your blog, this option may be a little too risky.

Not to mention the fact that it's not always easy to advertise that you offer this.