Oven shelf

transitionculture.org/.../

Note how the oven doesn't completely envelop the base as most ovens do.
With this arrangement, the smiling baker has created some shelf space for necessary supplies.

Brick Oven

www.chimkc.com/Worksamples/Bakeoven.htm

The oven above is not, strictly speaking, an earth oven, but the elements required to build it did come from the earth. If you have masonry skills, then you could construct a very classy oven like this one. I do like the stucco which makes an all brick oven less busy.
My skill level is fairly low, so I'll stick with the easy-to-build ovens.

How to Build an Igloo

www.monsterguide.net/how-to-build-an-igloo.shtml

Not exactly an earth oven, but you get the idea.

Stone Oven

www.earth-connection.com/plants.htm

Obviously not an efficient oven, but does everything have to be efficient? Looks like it was built with rocks from the neighborhood. If there's a thin, flat rock on the top, it's entirely possible to bake a flatbread on top of the oven while another bakes at the same time inside.

Bread Oven Manitoba Canada

www.mhs.mb.ca/.../13/selkirksettlement3.shtml
The Lord Selkirk Settlement at Red River, Part 3
by Anne Matheson Henderson

"Most of the homes had an outside oven in which bannock and later bread and pies were baked. These were used long after the modern stoves came into the settlement ..."
The oven is intact, but note how the square oven opening has sagged. A rounded opening would have been stronger.

Greg's Oven

www.geocities.com/mosesrocket/

Lots of information with photos concerning the construction of Greg's oven. I was particularly interested in the "oven hat." Greg said he found the metal object on an abandoned farm and thinks it's some type of farm implement. Anyway, it keeps the rain off the oven.

Bread Oven Quebec

From
THE BREAD OVENS OF QUEBEC
An excellent but difficult to find book.

This is one of my favorite photos of a bread oven. They really don't come much more pastoral than this. Taken in Quebec, Canada 1898, illustrating the archetypal Quebec clay oven. Elongated beaver shape. Steel oven door. Shed roof. Cribbing oven support.

Bread Oven Chile

www.portlandfood.org/index.php?showtopic=6074

Note the round dome sitting on the square base. With this arrangement, you'll have corners on the base in which to store items. There is also a base extension (it looks like a big step) which allows even more space for perhaps resting a bread or pizzas.

Bread Oven South Africa

www.sekhukhune.gov.za/projects/kamoka_open%20...

I don't know if this is a posed shot or what the women are actually doing. Does it take two people to load the oven or remove the baked bread? Too bad there are not more photos of this.

Stone Oven Hawaii

www.konahistorical.org/tours-oven.html

The oven is a recreation of the ovens that Portuguese settlers built in Hawaii.
I really like the stone theme in the base carried right over the top of the dome.