If you do a Google search for the below functions (or you can click the short links next to it) you will see a good animation plot of these functions:
"sqrt(x*x+y*y)+3*cos(sqrt(x*x+y*y))+5 from -20 to 20" : http://goo.gl/zJPhT
"sin(5.5x)*cos(5*y)+x*x+1 x is from -1 to 1, y is from -1 to 1, z is from 0.1 to 2.8": http://goo.gl/FQve9
"tanh(y(y^4+5x^4-10(x^2)(y^2))/(x^2+y^2)^4)": http://goo.gl/aBlvT
If you can't see the animation, here is a brief video for all the above three functions:
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