A Book of Russian Idioms Illustrated
It's an older book online but incredibly worth having and sharing online.
It's very easy to use; it's fun and educational. Although it's an older material, given the layout and the approach to learning the idioms (a big part of Russian), it's worth having in your merlot library. The learners can go to any chapter and letter. They can review any idiom-the picture are very funny and help in getting acquainted with Russian.
Read the introduction: http://idioms.chat.ru/
It's a pleasure to read this book-and, it's so well written that it will bring a smile to many Russian speakers in any country (including Russia). :)
Thank you to the Hofstra University Russian instructors for sharing this link!