I have been designing resources for many years as I worked with preschool and primary age youngsters with delayed or impaired speech and language skills. The resources using symbols are free. My latest resources which I have illustrated are extra tasks based on Marion Blank's Language Levels (previous ones have been free). They can be used with groups of mixed language ability and are reasonably priced.
A Russian fairy tale retold at three levels: simple plus symbol-support of Widgit/PCS symbols, early reading with illustrations, longer version to read aloud with many opportunities for spoken language tasks. Additional activities: colouring, read / match caption to picture and sequence.