Added curatins.

Opaque non-dense structures.
They have white icon, so color can be changed with color var.
![](http://i.gyazo.com/c8445ab3d9e0a753ba18b81714a9aad4.png)
![](http://i.gyazo.com/4feadc02c15a47f08c38694756c52d31.png)