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.
Symbols (c) Widgit Software 2010. Print on A4 to file in a Display Folder. Use for practice in odd moments and frequent revision. 4 pages including MONTHS and SEASONS, DAYS OF THE WEEK, O'CLOCK TIME, and ALL ABOUT ME. You can build up a useful long-term resource by adding a vocabulary page for every new topic. Could also be used for EAL.