Children's Library Shelving - Collection separated by large, distinct letter signage helping children to more easily locate materials and understand library organization. Signage also helps young children with letter recognition.
Weeding brochure (designed for school library, but applicable anywhere! Great resource for collection development (and the very necessary counterpart of eliminating titles) from elementary or middle school collections.
Have students paint circles in shades of green great bulletin board for my Eric Carle author study. Would add a writing piece where kids would paint the cover of thier favorite book and write the title and why they like it.