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#8: I would love to see incorporating green into this design somewhere. Otherwise I really like the play on the "o's" as well as how prominent the word Yoga is in the logo.
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#2 & 3: Really like these a lot as well - they are a bit more subtle and I love the tone of grey but feel that the rust/orange and green get a little lost so maybe trying a bit deeper shades would make them pop more. The gears are kind of fun and different - very creative.