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.