This is my portrait vessel lesson - although the last two years I used it
only a couple made portrait vessels.
http://www.princetonol.com/groups/iad/lessons/middle/Lessons/8afr-pot.htm
I put notes on the plan how I used it with 6th grade and how you could use
it with high school (it was actually one of my high school advanced ceramic
students that got me interested in African ceramics).
I have one more lesson plan on African inspired ceramics -- but don't have
it written up. It was inspired by the family grouping terracottas from
Nigeria. Students made a lidded bowl (clay pressend into Cool whip dishes
for bowl) - with rounded lid (made over a newspaper hump). They placed
figures/animals on the lid to represent their family. Some students glazed
them - some did the brown wood-look patina. Others painted them black and
embellished with oil pastels and puffy paints (looked like beaded vessels).