Pebbles - Fenton
These bowls are often sold as Cobblestones but they are Fenton, not Imperial. You can confirm this by checking the back which, in the case of Pebbles, has Fenton's Honeycomb and Clover pattern. The pattern name comes from the pebble texture on the inside of the bowl.

You'll find these mostly in green in the small sauce size.

But larger master bowls are also available such as the ice cream shaped bowl in amber pictured at right along with a ruffled sauce also in amber. Overall, any shape or color should be considered scarce.