Due to my work schedule, money, and a variety of personal reasons, my daughters aren't in a formal preschool. Last year we had a neighborhood preschool and this year I just work with my girls on my own. We call our "preschool" time "Theme of the Week". I bought some cheap supplies at the school supply store and the dollar store.
Each week we focus on: a letter, a number, and a theme
The letter and number can easily be incorporated with the theme. We start off each "Theme of the week" session with our version of "circle time". Circle time always has the same order, which helps them to know what comes next and what to expect. Here is our order:
We review what season, month, day, date, and year it is. (I love this calendar I bought at Target that has these magnets for different events. My girls love to look at it and know what is coming up later in the month).
#4-The Pledge of Allegiance
#5-Colors and Shapes review
#6-Letter of the week and number of the week
pre-writing skills (like mazes) and eventually writing the names or the first letter of their name.
The theme activities are spread out through the week. I usually have a coloring page related to the theme. I get out all the toys related to the theme, books, activities, food activities related to the theme, a movie related to the theme, and crafts.
My girls have loved our "theme of the week" time and I like feeling like I am teaching them something. The number, letter, and theme picture stays on their bedroom door for the week.