I already have used it but I used the quote function so the list of colors redirects to this thread and the post where it was taken from. Would it be okay to do so with mentioning where I got it from without the quote function?
Ahh I remember that signature! Looks like the forums have skewed it slightly over time
The way I made that was sketching out a rough idea on lined paper what each line might look like, then find the characters to make it possible. It's slightly more difficult doing it with centre alignment, but really it's just trial and error. It'll take a while but you'll get the hang of it.
I'd advise looking at the all-character wave on post 4 as a starting point!