I made this very simple terrain file...
I used SMP's realistic as the template, I hope he doesn't mind. :S
Just put it in the "skin" folder in your World of Minecraft client folder.
Enjoy, and as for flowers... they're for sissies!!

P.S. I found it very useful for making pixels. ;)

Here's the link for the Realistic Pack... it's much better than mine, and covers alpha as well.
http://seanmp.tumblr.com/post/421279216/realistic

Files: 

terrain.png