Yep me too, I really like this design but when I read it was called Envy wondered what it'd look like if they were green too? Maybe that'd spoil it though and take away from the message! I do like it loads though :)
I like the concept too, it just needs some more colors and maybe on a different colored shirt as well. I'd make the bird a different color and use the impact of the colors to highlight the air/water difference. Nice!
About my design
The Whale says:I wish I could fly in the endless sky like the bird.