Here's a trick to impress your Valentine. Just type in this maths equation in the Google searchbar:

"sqrt(cos(x))*cos(300x)+sqrt(abs(x))-0.7)*(4-x*x)^0.01, sqrt(6-x^2), -sqrt(6-x^2) from -4.5 to 4.5"

 and wait for the magic to unfold.