Best tutorial I've seen for wainscoting for your playroom. Use 1/4" MDF. Buy 4'x8' sheets and have Lowe's cut them into strips the width you want. No problems with warped boards and much cheaper than wood. @Jenny Freehardt
Faux Wainscoting - Inexpensive & easy peasy!
Colonial Wainscoting Measurements by SnazzyLittleThings.com More
#1. Add faux thick baseboard with this simple trick! -- 27 Easy Remodeling Projects That Will Completely Transform Your Home
#17. DIY wainscoting with strips of wood. -- 27 Easy Remodeling Projects That Will Completely Transform Your Home | Listotic
DIY: Faux Wainscoting added to my builder's grade home.
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Board and Batten Step by Step Tutorial
Faux Wainscoting-This is the one we want
The Ultimate Guide to Wainscoting: 25+ wainscoting ideas - interiors-designed.com