I made this for a teacher gift this year, using instructions found here. I made my own 'subway art' using Silhouette Studio (the software is free to download & I use it for a lot of printing, not just to cut with my Silhouette SD).
The words are printed on acetate, using a laser printer (or a photo-copier). I don't have one, so I printed them on paper & took it to my local library, along with the acetate. Ink-jet printing won't work. The words just flake off. Trust me. I found out the hard way.