Making DIY Subway art was a way of recycle and re-purposing those big paper shopping bags, and when your re-usable ones get broken in, you can do the same. Send a message, put in a sentence or use smaller sizes pieces and a large frame to make ‘ransom note art’ or memo board. Putting all the store names together I don’t really like, to me it comes off as materialistic and therefore tacky, but ok for a sample.
So I searched to see if I could find some samples, most of them look like this… Now I live in NY state about 30 minutes or so away from the City…I’e NEVER seen Subway ‘art’ look like this. 
The way they did theirs in the DIY link I would have done mine sideways and to the decoration in the board used. (Anything pink would have went in the pink background, all the others in the black part. (Then if the rest didn’t fit in the black part of the board I would have either put them on the others side (vertically as the final creation is shown) or made a second one.
I’ll have to see if I can find a thick poster board to make one or 2 of my own. This way I can still put the ribbon on the edge but just use that tact gum to hang it on my wall (plaster walls stink for hanging things esp. when the wall gets cold)
As I KNOW I have souvenir bags (like from a few stores and Restaurants in Toronto, as well as some other assorted brand ones I’d rather not use to giveaway. SO I absolutely LOVE this idea. I also have a magazine type thing that can be used to add some flair to it as well.
(will have to see about taking a few pictures once I sort out pictures on my phone and transfer them to a flash drive.)
If you do not have any of these sort of shopping bags Like from big Department stores like Macy’s, lord and Taylor etc you an always look for words you want to use in a search or make them yourself in word or image maker (Like Paint shop pro) so you have the colors and fonts you want and what size font would suit the size of your over all ‘art’ or board you want to hang. However you like.
Not sure if the plastic ones are used but as I said that’s up to you. if you have doubles why not cut out the letters repeatedly and make a ‘Ransom note’ looking message as well. You could always change it week by week or month… (anytime you get bored with it)
Crafter Crums 