I played some more with the hexes today, after cutting a bunch of them last night. I think I still have to cut more but I'll see.
To make the I C blocks, first you sew sets of strips together of: light/dark; medium/light and medium/dark. These have to be half of the hex patch, plus 1/4 ins. seam allowance.
Then you cut the hexes from those strips and separate them as stated above. I took a large cardboard and separated my hexes also so I could choose.
Then you start to build your city. Following, you will see a light/medium hex patch on the left and a medium/dark patch on the right and the last patch at the bottom of these two, is a light/dark patch and that is one building. Now you continue to build and fill in with just plain hexes as you like and so on.