I found some interesting materials at a local fleamarket (http://www.electronicsfleamarket.com): a canister of lithium sheet metal, and a bottle of fine zirconium powder (325 mesh). The zirconium is stored under water since the dry power can self-ignite, or may be ignited by static electricity or shock. Confusingly, the MSDS sheets say that dry zirconium powder must not be allowed near water, but if it is to be stored, it must be completely submerged in water. I carefully dried a very small amount, and sprinkled it over a flame. If you know of something interesting to do with these chemicals, please let me know.