My computer is stupid and won't let me see it. But from google images I found some that match your description.

Begonia

Red Caladium

Coleus Color Pride (this one may be the best yet)

Caladiam 'Lord Derby' (another best choice one)

Phormium Pink Strip (maybe)

phormium tenax dazzler (maybe)

There are probably more but like I said my computer is stupid right now.

That's a camo leaf.

Its called Rhoeo discolor.

People use it to show plasmolysis.

a tree leaf

leaf

It's like pinkish red? purple or something with green. It's long. I can't explain more broadly but here's a picture:

http://tinypic.com/view.php?pic=ezodi&s=6

I need it like right now, please tell me the name. Thanks!