The term "hollow core door" is rarely seen in the same company as the words "sophisticated" and "classy." I daresay we've found some exceptions to the rule, as seen by a number of DIY projects that take this basic $30 hardware store item (or even less if it's recycled) and transform it into something entirely new. See if you agree.
Above, Thimble and Cloth made this white desk that looks similar to BluDot's Strut table.
This basic door was customized by Jenny Komeda with raised paneling to make it look more expensive. It's just one of many ways you can upgrade on the cheap.
Brown Eyed Fox covered one with chalkboard paint, and left the edges bare, before she installed it as a sliding barn-style door.
Gus and Lula figured out how to create floating shelves out of hollow core doors.
The talented Sarah Dorsey made an ikat fabric-wrapped Parsons-style table for her bedroom.
Instead of fabric, cover a couple of doors with wallpaper for a quick, easy and temporary art project. This is from Better Homes & Gardens.
It doesn't get much easier than this table seen on Design*Sponge. Find a table base and top it off with a hollow core door, and you've got instant furniture.
Design Life Kids made this Garden Bento Box for the Philadelphia Home Show Upcycle Challenge. It's part cooler, planter and serving tray.