Terra Incognita is largely based the work that produced the a previous SMF theme, Endar. As such it does have many similarities. Though these may not be immediately obvious.
The template comes in hues of red, browns, greens and yellows. Largely red and tan and has an unusual layout. It is constructed almost completely without the use of tables. As a result a large proportion of the XHTML has been rewritten.
There are detailed instructions and information in the readme file contained in the Terra Incognita zip archive. As well as a header PSD file for logo customisation. Please consult the readme HTML file, though support is available.
There's also some alternate language graphics available. But the corresponding language files must be installed for the default SMF theme for these to work.