Movement is the key. Wear a head net to hide your face and to help break up the Camo tarp you have on your canoe just cut some Reed and grass all around you!
Don't need much to break up the pattern.
I have also been taught a way to make my own grass matts but need a bit of time with a camera to share with all of you.
Save you money - use what you have - just add a bit of local grass and reed.
JW