In the well-known Muppets version, Kermit begins by lamenting his green coloration, expressing that green "blends in with so many ordinary things" and wishing to be some other color. But by the end of the song, Kermit recalls positive associations with the color green, and concludes by accepting and embracing his greenness.
It's not that easy being green
Having to spend each day the color of the leaves
When I think it could be nicer being red, or yellow or gold
Or something much more colorful like that
It's not easy being green
It seems you blend in with so many other ordinary things
And people tend to pass you over
'cause you're not standing out like flashy sparkles in the water
Or stars in the sky
But green's the color of spring
And green can be cool and friendly-like
And green can be big like a mountain, or important like a river
Or tall like a tree
When green is all there is to be
It could make you wonder why, but why wonder?
Why wonder, I am green and it'll do fine, it's beautiful!
And I think it's what I want to be