Here i included pictures of every step i made.
Step one, building out of a included SL-Shape, cube, using "Sculpty Extrude" only.
http://www.flickr.com/photos/29521483@N07/2806626336/
Step two. UV - Map, choosing spherical, "Apply and close". Open TCE, change nothing. Export as "Second life sculpted prim".
http://www.flickr.com/photos/29521483@N07/2805777129/
Sep three. Import Image in SL, "build" a cube, apply the texture map. And result. Hrmpf.
http://www.flickr.com/photos/29521483@N07/2805777259/
I know not, what i make wrong...
Antario