The track editor has a Toscana theme where you can change the time, 1900 seems to be the best time to set it to. You can make a track then save it and use it in Arcade mode or in a free run. There is also the Toscana rally circuit where the time changes.
This is awesome guys 👍
Unless you got a different copy of GT5 than we all did, there's no sunrise or sunset happening on any of the SSR tracks. Adding one in with Photoshop is definitely possible, and within the guidelines of the Editing laid out in the first-post, but the theme asks for you to find one happening on a track...
You've still got until Sunday to throw another entry into the mix if you'd like