I was looking for a good Corona SDK logo to put in my app, and all of them were either low-resolution or not what I wanted. Thus, I created four high-resolution (2048x384!) “Built With Corona SDK” logos that you can use as a splash screen if you want, or just put somewhere in your game/app. They’re not official, but they still look pretty good 
If there’s anything you want to change about them, the .sketch file is included.
Download them here: