A couple of weeks ago, I started doing a "Mom and Ollie" preschool. Why? A couple of reasons: (1) it was something to do and (2) I did a "Joy School" thing with Rhett when he was three and would feel like I was getting lazy with Ollie if I didn't. We only do it once a week and it usually only takes about an hour, so it's perfect. My sister found this cute little e-book, and I've been using it.
It's letter-based, so every week we do a new letter. During our "school" sessions it doesn't seem like he's learning much, but I know he's at least recognizing letters because he points them out the rest of the week. When asked what letter we learned Wednesday (M), he consistently responds, "Marshmallows!" Close.
His favorite part of school, by far, is the sensory bin. I accidentally dumped a bucket of wheat. Smooth, right? Rather than throw it out, I had the idea of using it for this. And honestly, even I like playing in this.