It looks like Minecraft is going to be receiving tall grass of some sort at some point. Notch posted a link to this image on his twitter with no more relevant information, and nothing else has been said about it at this time. Perhaps it's something we'll see in this week's upcoming Beta 1.6 update.

What? I know it's just grass, but it's Minecraft. Shut up. Anything Minecraft is news, always. Don't judge me.