A few of the concepts I did last year for Cars: Fast as Lightning (Android and iOS). Most of my art was for decorations, but I also did a few buildings and car costumes. All the final assets are by my wonderful colleagues, and everything, of course, belongs to Gameloft and Disney/Pixar.
Some car part vending machines that unlock alongside Boost
Obstacles like this one are placed by players along the tracks they design. Successfully completing the quicktime event gets you a speed boost (the Win state); failing slows you down (the Fail state).