Build Blocks by Poklik is a simple 3D sandbox game with blocks for Wii. There’s no objectives, you can just freely build stuff with blocks on board. There are also Nokia S60/Asha versions available (partially pay versions).

Build Blocks Wii (v 0.2) - 3D blocks sandbox game for Wii
Watch this video on YouTube.

http://wiibrew.org/wiki/Build_Blocks