Ads for exchanges and linking sites should act as Mouse Click Magnets. Effective ads should draw your attention to them and get people to click. All this and it should be under 12k!
In this tutorial you'll find criteria of making such ads.
Easter eggs are traditionally hidden confections. Often programmers will put these in software for users to find or stumble on and give amusement. In this activity you will learn how to make a hidden Easter egg for your site for your guests to find.