3D animation of a cube rotating x6

I need a simple 3D cube animated as attached. The cube will need rounded corners. I will supply the graphic for each side, all sides have the same graphic. Just smooth rotation, file small as possible to acheive this, clear background

I need six cubes as single files, animated giff.

This is a simple job, I would do this myself but can not round the corners of the cube.

Files attached:
1- B test- shows the animation
2- Cubeshape - show the shape of the cube required.