These two great sites provide excellent applications to build your own printable crossword puzzles. Just use the words and clues supplied in the PDF to create a more custom version. For both puzzles we created, we used the title Mudd Day Crossword Puzzle.
On the Teacher’s Corner page, teachers can change the font, add images and print a separate key.
With Discover Education, we used 34 x 34 to create our puzzle, and it worked like a charm. We left the size at 30.