Can't live without them...
A friend of mine has one in a similar shape to this: Tea Pot by Tye River Pottery. I love the rusty colours and elegant shape.
I'm not sure how functional this one would be, but it's extremely cute to look at: Pear Teapot by Clamlab.
A Brown Betty is a classic, of course:
The turquoise glaze on this one is just beautiful: Personal Teapot by Hodaka Pottery.
And this sunny yellow one would give the Little Yellow Teapot a run for his money! Vintage Sunshine Yellow Teapot: