I'm not sure what you're asking for; do you want us to give you examples of real-life applications of conic sections? Or do you want a real-life application that uses all four conic sections?
Ellipses - Planets/comets and other celestial bodies follow elliptical orbits.
Parabolas - satellite dishes and mirrors can be shaped as parabolas.
Hyperbolas - Lampshades cast hyperbolic shadows, and the cooling towers of nuclear reactors have a hyperbolic shape - lampshade: http://www.pleacher.com/mp/mgifs/gifs2/lamp.jpg and a cooling tower: http://www.pleacher.com/mp/mgifs/gifs2/hyp1.jpg
And I'm sure you can think of a few real life applications of circles!