Hey Rubicon
Just get some old diving duck decoys and paint them the colors that you want. They will work just fine. Scoters aren't the smartest birds ya know. Also you can make some silhouette decoys to put in the spread and they work fine also. We also use bleach bottles painted black with a spot of white here and there. Use as many as you can put out. They will come to more decoys than less. And if ya shoot out of a layout boat they are really hard to hit. Take lots of bullets