What a great question. I really don't know. I know there is a young lady in the UK who is very famous for creating scenes with the typewriter. Yet, it isn't poetry, only characters used.
I have a suggestion. Do you have Excel or another spreadsheet software program. If so, I would go to excel and size the cells as even squares using the column width and row height feature. Then I would create the shape by filling in the squares with a color. Then I would write the poem. Then I would type the letters words into the colored cells / squares until I had what I wanted.
The bigger challenge would be to place that into a hub. The module or capsules I don't think will facilitate the spacing of the characters. So, You would need to use Corel Draw or some type of software that would covert that image to a photo image like jpg or ping. Copy pasting the image from excel and not get the cell lines would be a question I don't have an answer too. Maybe another here at Hubpages does?
Good luck. And, write about your adventure and post it here at hubpages.