I wrote six plans for a pre-kindergarten class a few years ago. I've finally gotten around to posting them, and you can find them here. The plans cover science, art, and math, and seemed to work well with the children in the class I taught.
One of my favourite lessons was the "Classroom Treehouse" where we actually made a house structure from cardboard boxes, and installed it in the room. I haven't got any photographs of it any more, but the children really loved it. They especially enjoyed being a part of the building process.
Take a look and see what you think. The plans are:
Snow & Ice - Experiment with states of matter and explore the properties of snow and ice in the classroom (Science)
Shape Animals - Create animals by choosing shapes from a set and assembling them (Art)
Mardi Gras Necklace - Use beads and string to assemble a necklace (Art)
Favourite Things - Children make a picture of their favourite things (Art)
Paperclip Measurement - Use paperclips to measure items in the classroom (Math)
Classroom Treehouse - Construct a building that the students can play in, and use for imaginative play.
I hope you enjoy them!