If you want to make some rounded corners for your favourite pictures, try RoundPic.

Online tool for making anti-aliased rounded corners (very Web 2.0!) for avatars and images

First of all, what is revenue sharing exactly?

A percentage split between the general partner and limited partners of profits, losses, cash distributions, and other income or losses.

Source: EC

Basically you just put your AdSense codes, post on forums and earn money for it.

Click here to see the list of AdSense Revenue Sharing websites.