The creators of the crossword for this tee shirt are named Gia Bosko and Dan Harsell. I would like the T-Shirt to include a simple congratulations to them, probably located on the front with some artwork related to the crossword theme.

hallo thanks for an invitation, do you mean that artwork is on every single block of crossword?

No. I think the front of the T-shirt could have a small design (like where a lady pocket might be) that says something like:
Gia & Dan NYT Crossword Debut” and the date with a little Dr Seuss artwork.

The main crossword would be on the back and could be partially completed with some of the theme clues filled in.

I just put a design, please check it. Thanks :)