How do you choose what skin to buy for your champions

We all know everybody loves buying skins, and whenever it's possible we usually make the effort to buy a new one for our favourite champions. And here I am asking you, how do you choose what to buy and what to avoid? You choose by price? By favourite ones? You choose the best? You pick randomly? You buy one for every most champion used you have? How do you? Personally, I like to select different champions I love and that are more frequently used, then with a random number generator I remove them extracting the numbers, and "There can only be one!" {{item:3751}}
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