For me, I turn it into motivation. I check out the code that dazzled me with it's brilliance, I go through every line, stop to understand everything, then I ask

For me, I turn it into motivation. I check out the code that dazzled me with it's brilliance, I go through every line, stop to understand everything, then I ask questions. After that I normally create a home brew project that incorporates the lessons learns and drives them home, and, sometimes, improving on them. Obviously not quite from a design perspective, but it may still be useful.