In general, I am not a big fan of workbooks, at least not for younger learners, but I have found great success lately in making a stack of "Preschool Basics" and "Kindergarten Basics" workbooks accessible to M.
She gravitates to the basket of workbooks I have in the kitchen and independently completes the exercises, while occasionally asking for help with directions. For her, it's just plain fun, but it reinforces key concepts in literacy and numeracy, as well as critical thinking skills, like pattern recognition.
These types of workbooks can be found at many convenience stores, supermarkets, and toy stores. They, along with children's magazines like Highlights and the Cricket series, can be entertaining and helpful tools for homeschooling.