Bridge pattern double bridge

I am trying to design a system. I thought that bridge pattern would be helpful but maybe I am going mad and there is a better option. I am not a software pattern expert.

I need to draw a shape depending on the shape type, the colour and the wall where is going to be painted on.

There are two shapes: Rectangle and Circle There are two colours: Red and Blue There are two walls: Wood wall and Concrete wall

First naive attemp would be:

                    ----Shape---
              /                      \
        Rectangle                     Circle
          /                              \
BlueRectangleWoodWall               BlueCircleWoodWall
BlueRectangleConcreteWall           BlueCircleConcreteWall
RedRectangleWoodWall                BlueCircleWoodWall  
RedRectangleConcreteWall            BlueCircleConcreteWall

In total 11 classes! I think that's not a good idea. If I didn't have to worry about the type of wall, I would do a bridge:

      ----Shape---                        Color
     /            \                       /   \
Rectangle(Color)   Circle(Color)        Blue   Red

But I need to add the wall variation so I thought doing something like a "double bridge"?

      ----Shape---                            Color
     /            \                          /      \
Rectangle(Color)   Circle(Color)           Blue(Wall) Red(Wall)


        Wall
       /      \                         
 ConcreteWall WoodWall

Is this a good idea? I am not a software pattern expert. That's why I am asking for help. In this case I only decrease from 11 classes to 9. Thank you!