These are some visual posters for metric unit conversions. They come in a variety of colours. Also included are smaller versions for students to tape onto their desks. A neat idea would be to laminate them which would allow students to use dry erase markers to draw out how many steps they took up or down the metric stairs.
The package contains 2 compressed files: one with American spelling (i.e. liter, meter, etc.) and one with Canadian spelling (i.e. litre, metre, etc.).