Leaf Tendrils: -
In this case the leaf is modified into wire like coiled structure that help the plant in climbing some objects as in pea.
Leaf Spines: -
For protection as in barberry.
Leaf Pitchers and Leaf Bladders: - These are modified forms of leaf used for catching and digesting insects. Examples include insectivorous plants such as pitcher plant, venus fly trap and bladderwort.