It's a site where you can place text in, pick a color scheme, font and a layout. It shift the words around for you. This isn't made to be originally yours, but it's fun none the less.
I could see someone putting in a lyrics to a song, lullaby, nursery rhyme for a kid or baby's room. Print on some nice paper, frame it and hang it on their wall.
One of Isaak's favorite is Twinkle Twinkle Little Star. I found the lyrics, pasted them in Wordle and this is what I got:
Here's a few versions of that: