I have designed and built many unique kilns, some examples are featured below.  
 If you are in need of kiln building or wood firing assistance feel free to contact me
MCC Wood Kiln
This kiln was designed by Jake Allee, Mike
Maguire and myself. It was built in 2005 at
McLennan community college in Waco, TX
SFA Soda Kiln
This is a cross-draft catenary-arch kiln
that is fired on natural gas (2 Eclipse
TR-10 Venturi burners).  Once it
reaches temperature,  a solution of
water and soda is sprayed into the kiln,
which forms a permanent glaze on the
pieces. It was built by my students and
I during a kiln building class at Stephen
F. Austin University in Nacogdoches,
Texas in 2006. I designed this kiln.
Barrel-Arch Wood Kiln
This is a cross-draft kiln with an internal firebox,
it was built by my students and I during a
kiln-building class at the University of North
Texas, Denton, in 2005.  I designed this kiln to
fit in a tight space, it replaced a catenary arch
wood kiln of similar dimensions.  It reminded me
of an army tank.  
Hybrid Kiln #2
This is a barrel-arch crossdraft salt-kiln. It is fired on gas
and/or wood.  This kiln was built by my students and I
during a kiln building class at the University of North
Texas in 2005.  It replaced Hybrid Kiln #1, with a better,
more efficient design.   This kiln was featured in
Ceramics Monthly in summer 2006.  Elmer Taylor and I
collaborated on the design.
Hybrid Kiln #1
I built this experimental salt kiln at the University of
North Texas in 2004. It was a catenary arch cross draft
with a  burry-box and was fired with natural gas and
wood.  Elmer Taylor and I collaborated on this design
to build a good "learning" kiln for students.   
Essentially, the concept was for the user to learn more
about firing than just flipping switches.  The kiln
required a little bit of stoking with wood and careful
monitoring in order for it to reach temperature.  The
extra work involved would "pay off" in the end.
My First Kiln
With the help of some friends from the University of Eau Claire, I built this kiln at my parents'
house near New Richmond, Wisconsin in 2001.  This jalopy is the first "big" kiln I ever built.  I
salvaged used firebrick for a couple years and only spent about $100 to build this beauty.  I
have added on to it through the years, reluctant to tear it down and rebuild it.  The design came
from the advice of my professor Mike Weber, a wood-firing guru whose "Rocketman" wood kilns
have been built and imitated all over the country.  I have fired this kiln over 20 times, and it gets
better each time!
C.R. Wood Kiln (a.k.a.
Fat-boy)
This beauty was built in January 2008, by students and I
during a kiln building class at College of The Redwoods in
Eureka, California.   It's a bigger, better version of the MCC
kiln (see below) and is the best wood kiln I've built or fired so
far.  Once you start stoking, it just wants more and can never
get enough, hence the nickname.  This kiln was destroyed
during a 6.5 earthquake on January 9th, 2010.   The
chimney stayed up, thanks to 9" thick base and steel
reinforcement.
**Earthquake note**
No worries about the kiln, we can rebuild it -  we have the
technology.... perhaps more "earthquake resistant" next
time.  
The shaker resulted from a  slip-strike fault, which
produces mostly horizontal motion (see where the bricks
landed).  It  wreaked some havoc in the area, but luckily
no people were killed.  

R.I.P. Fatboy, we had 15 great firings.    
The HYDROGEN KILN
I have been researching and experimenting with firing a kiln with
hydrogen for a couple years now.  Hydrogen has great potential as a
renewable fuel because it can be made from water. I've created a
blog (which needs updating) to cover some of the technical
information and ideas behind it.  Click here to view it:  
http://davezdrazil.com/blog/
f
Also, see my article "Firing With Hydrogen"
in Ceramics Technical #33
"Bubble Boy"
This is a very special and versatile little kiln.  Although it appears to be
small from the outside, it packs in quite a bit of work.  I designed the
chimney (stack) of the kiln to also function as a stacking space, thus
greatly improving it's efficiency.  The chimney is made from insulating
firebrick and is top-loading; a fiber extension is then placed on top
during the firing to improve the draft. See more at my blog
Double Chamber Wood Kiln
(a.k.a. "Salty Dog")
This kiln, built in 2010, replaced the Fatboy kiln after it was
destroyed by an earthquake. There are two chambers- wood
only in the front and wood/soda in the back.  I designed this
kiln to fire both chambers or just the back one if needed.