Leaf Surface Area - Practice non-standard measuring with leaves, great way to introduce the concept of area. Visit Kindergarten Lessons for more details and measuring ideas! PBS has a fun activity that integrates science and math. Kids shine a flashlight on a leaf and trace its shadow on grid paper to find the area of a leaf!
Leaf Symmetry - Check out the cool art project Beautiful Ideas did!
Science - Is a Green Leaf Really Green? Click here to find out! Also, check out Exploring Life Community's photosynthesis experiment!
Create a Leaf Skeleton - ehow
Descriptive Writing - "Meet My Leaf, " free printable from Scholastic
Leaf Descriptions - Set up a leaf station in your classroom. Kids work in pairs. One child describes a leaf. The other child has to find the correct leaf. This activity is a great way for kids to learn the importance of detail (adjectives) and comprehension (listening skills).
Leaf Hunt, Tally, Graph, Fractions - Classic activity that's always popular with young students. Go on a leaf hunt outside around the school yard. Have kids tally their leaves. Then, as a class, graph your findings! Afterwards, have kids write the fraction for each color found. Younger kids could also practice their patterning skills with colored leaves.