PyBlocks

A simple app, where you can build from a set of blocks in isometric view.
Pick a block and place it on the floor. Scroll the mouse wheel to rotate the piece, or click using right mouse button to remove a piece under the cursor.  You can switch the color of a piece to lay,  the floor color and the sky color.  

In order to see what you did from other perspective click the one of the rotate buttons in the bottom left corner of the screen.

Finally you can save and load your work to and from your drive.