For the first quote, I used was a black and white daytime photo to show the feeling of a day without sunshine. I use Agency FB font, size 25 which just enough to read comfortably.
The second quotes I use a black background, a moon with a few stars to show the ideas of night. I used Bradley Hand ITC font with size 17.
The third quote I used a beautiful cartoon night background. I use Monotype Corsiva font and 29 font sizes. For more easier reading, I use a white font color with black outline. This more prominent the font and easy to see.