Use metal marquee letters to spell out a name, to offer a playful directive ("EAT" or "dream," for instance), or simply to add a bold, graphic element to your interiors.
I've always meant to ask Brian Patrick Flynn (a.k.a. Decor Demon) what the SEVEN is all about. I hope it's more about a Prince song than that scary movie where Gwyneth's head winds up in a box.
(See the answer in the comments section!)
Tip: You don't have to go over-the-top industrial to pay homage to a loft's history. Here, Flynn replaced builder-grade laminate countertops with poured concrete to give the kitchen a hint of industrial style.