Here's an original post for Rice Krispie Treats, the simple candy using melted marshmallows, butter and Rice Krispie Cereal. There are a few easy variations in this post too.
I also did a post for Halloween using Candy Corn in Rick Krispie Treats.
And there are so many more on the net!
Dinners, Dishes and Desserts has a Peanut Butter Butterscotch Treat
The Bitter Side of Sweet has Chocolate Chip Cookie Dough Krispie Treats
Cookies and Cups has Lemon Meringue Krispie Treats
Living Well and Spending Less has White Chocolate White Krispie Treats
Mallow and Company has S'mores Rice Krispie Treats
Crumbs and Chaos has Double Chocolate Salted Treats
Or So She Says has Coconut Rice Krispie Treats