Customizable landing page templates on-the-fly & php programming

I need 3 basic landing page template layouts that can be completely customized on-the-fly by user, using a WISIWYG editor, that you will integrate into my Joomla website's member's area. User should be able to: 1) Choose which layout he wants to use, and change colors, heading and a few lines of text, images (using images that we provide). 2) Integrate his unique landing page code in the