The first link Lobo posted is a very good technique to achieve this. First, add mesh > Geodesic Dome. There are parameters which will appear under your Tools shelf at the left with parameters you can modify to get the look you want from the object. Remove the bottom half of the model, duplicate it (optional), then add the Wireframe modifier. The Wireframe modifier has an option to Replace Original checked automatically by default, but if you remove the check on that option, it will create the Wireframe on top of the original mesh, and assign separate material to it.

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