'You can tell a lot about a person from their kitchen," says Johnny Grey, an award-winning interior designer specializing in "happy kitchens," a design philosophy that focuses on bringing emotional, physical and psychological well-being into kitchen planning.

"A kitchen is no longer just for cooking. Often, the only time a couple will spend together awake, is in the kitchen," says the British architect, whose clients include Apple co-founder Steve Jobs, British singer Sting and millionaire publisher...