Rupert
Type (or paste) a rhyme into the box.
Click a Rupert to add it to the box. (Don't cover the text).
Print screen and crop 468 x 245 in Paintshop.
Make the green background transparent and save as a GIF.
Write a rhyme, or maybe paste.
Choose a Rupert to your taste.
Grab & crop & save the screen
As GIF with transparent green.