Mike,
I am making two assumptions. First is that you are running the Amesbury Skiff. Second is that you dont want to paint it.
Dave Morton in RI put on a clinic in Dec with his "Rock Blind"
One of the best I have seen for the New England Coast if there are rocks around.
The Idea is that you use a frame (Like Carls) to give yourself a bit of a hide in the boat. Then you use very dark landscape fabric (Black like the rocks at low tide) to drape around the entire boat. I believe Dave had some bungee sewn into the fabric to help attach it. I did not know where he was from 300 yds out till I saw the decoys.
Pick your days and start in more protected areas at the start. Anchor near the rocks and see what happens.
I prefer a boat with a splash well at the motor in the winter but dont have one at this time.
Bob