These packaged fireplace logs are made from recycled coffee grounds. The Java-Log, by Robustion Products, is the product of a discovery by engineer Rod Sprules that coffee grounds burn hotter than regular firewood. Java-Logs also emit a faint coffee aroma and create less soot and CO2 emissions.
You can find a Java-Log for about $2.50 at Whole Foods, and other grocery and hardware stores.
Found via Popgadget by Mia