A quatrefoil in design is basically a four lobed shape and is usually a symmetrical pattern that repeats itself. It is classic with religious and architectural history and modern too with it's bold and graphic designs. Let these bloggers inspire you to incorporate some quatrefoil:
quintessentially quatrefoil - inspiration board
quatrefoil drum shade pendant light - fantastic tutorial
my oh my your so good lookin... - quatrefoil painted dresser
kitchen mat up-cycled - painted quatrefoil of course!
the continuing transformation - quatrefoil stenciled walls
silver home office/craft room - alternate title: cursing quatrefoil!
quatrefoil stenciled parsons table - gorgeous
paint chip quatrefoil art - it looks great too!
tutorial hand painted rug - with homemade stencil