I managed to import a SweetHome3D room into Blender and now try to get the walls look as if they were painted using "sponge technique" i.e. covered with "ingrain wallpaper", painted with a basic color and then again using a sponge and a second color.
Any idea where I could find an existing material or how to create one myself? Images on the Net are usually not seamless and neither are ones that I could create with GIMP. Could Blender generate this effect procedurally?