DIY Bookcase Tutorial - great for behind couch in basement.
Ikea Besta + mdf + marble subway tile from HD = built-in wall unit.
DIY Built-Ins Series: How to Install Inset Cabinet Doors with European Hinges - Dream Book Design
Rustic and Neutral White Sliding Barn Door Entertainment Center - Family and the Lake House
built-in basement wall unit
my favorite if we end up putting tv on that wall.