The easiest letter to tessellate is probably the sans-serif letter I, which seemed so simple that I did not include it in this book. The letter that has the most possibilities is probably the letter L. There are ten pages devoted to various ways of tessellating this letter and there are many more ways that I did not use, though eventually they become so complex that they will not fit well with the way I create mazes.
The most difficult letters to tessellate are the letters O, K and R. Below is a picture of one of the ways I found to tessellate a shape that is recognizable as the letter K.
Most of the pages are devoted to tessellations of upper-case letters, and every letter has at least one maze devoted to it. Sometimes I also included some lower-case letters when they made for interesting patterns and mazes. Below is a picture of the maze for a decorative lower-case letter f.
the book with 86 different patterns. Solutions are shown in the back of the book. The book has 108 pages and uses 8 inch by 11.5 inch pages.
When I started I was unsure if the book was even possible, but by the time I was finished I had found so many different ways of tessellating letters that I now am wondering if a sequel would be a fun adventure.
Update: I made some changes to the book and the letter f tessellation was removed from the book, though it will soon appear in an new book. It had a worthy replacement.