I went thru a "Japanese" phase, collected several Japanese patterns and books and here are a few that I liked:
The Changing Seasons - quilt patterns from Japan - by Jill Liddell; Honoring the Seasons - quilts from Japan's Quilt House Yama - by Takako Onoyama; Circles of the East - Quilt designs from ancient Japanese family crests - by Kumiko Sudo; Japanese Inspirations by Janet Haigh; and, Fabled Flowers - innovative quilt patterns inspired by Japanese Sashiko and Origami Traditions- by Kumiko Sudo.
Hope this helps.