In 1904, Lefler illustrated Marienkind (''Mary's child''), a tale collected by the brothers Grimm in their Kinder- und Hausmärchen as tale number 3. A poor wood-cutter's daughter is raised in Heaven by Virgin Mary until the day she is banished for opening the forbidden door to the Trinity. She falls asleep and wakes up to find herself in a forest. The Grimm noted the tale's similarity to the Neapolitan La facce de crapa (''The goat-faced girl''), which was included by Giambattista Basile in his Pentamerone (1634-36) as well as the Norwegian tale Jomfru Maria som gudmor (''The lassie and her grandmother''). It also shares the forbidden room motif with Perrault's Barbe bleue (''Bluebeard'').
A year later, in 1905, Lefler produced the illustrations for a fairy-tale calendar published by Berger & Wirth, Leipzig. Illustrations include Cinderella, The Frog Prince, The Little Mermaid, Sleeping Beauty, The Goose Girl, Godfather Death, Hansel and Gretel, Mary's Child, Rapunzel, Snow-White and Rose-Red, and The Six Swans.
In 1907 Lefler and Urban illustrated the music book Kling-Klang Gloria, a collection of forty-six German lyric poems and folk songs arranged for voice and piano, published in Vienna and Leipzig by Tempsky & Freytag.