Unity's Asset Store have occasional 24 hour sales which I was asked to create a new interesting graphic for. I thought I'd make the numbers big and started by looking at interesting typographic ways of doing of large numbers.
I also looked at images of time and time travel for inspiration.
Since the '24' wouldn't live on it's own I also looked at suitable fonts.
Since this was for Unity I decided to use their font (Roboto) in an interesting way.
I started to think about the one or two word travel posters of the mid 20th century.
I started by taking the '24' apart...
I added 'hour sale' in lower case (so as not to clash) and a background.
And here is the full set of promotional logos.