The Holzminden escape is famous; 23 British Empire officers escaped from a tunnel in Germany, with 10 reaching Britain. There is decent coverage on this event; the book "The Tunnellers of Holzminden" by H.G. Durnford is well recommended.

There were many other less famous escapes from POW camps of the central powers during WW1. I recommend the following books: The Escaping Club – A.J. Evans, The Road to En-Dor – E.H. Jones, Within Four Walls –M.C.C. Harrison and H.A. Cartwright.

Gunther Plüschow holds the distinction of being the only POW to escape from Britain to Germany during either World War, so this was a noteable escape, too.

As you said, there isn't as much coverage on WW1 escapes compared to those of WW2, but there were still many escapes. I hope this answers your question.