Next cut 8 inch strips, from only your light fabric, then sub-cut them into 8 inch squares. You will need 18 plain light squares for the lap size quilt.
Now start sewing your 3 inch strips together along the long edges, light to dark.
Make sure your seems are just 2 or 3 threads less than a 1/4 inch. This is important again so that your blocks come out the right size and fit together easily.
Add another dark strip on the opposite side of two of these original strip sets.
And add a light strip on the opposite side of two of the original strips.
Press all seems to the dark side ( I had a quilt instructor once called it Darth Vader ironing).
Cut the long sets into smaller strips exactly 3 inches wide.
You will need 34 of these:
You will need 17 of these:
Now sew them together so they look like this:
You should have 17 of these. They are called 9 patch blocks.
Now you will begin to sew the solid squares to the nine patch blocks so you have 4 long strips that look like this:
Note this strip begins and ends with a solid block.
Next sew 3 long strips that look like this:
Next sew your long strips together so they look like this:
You can see that I started and ended with the strip that has the solid square first.
Some notes to consider...
I will be adding a border to my top to make it look more finished and to be a little bigger. I am going to use a medium green for this. Also you can switch the light and dark values in your quilt as I did in the blue one shown at first. It is very nice as well. You may also note that in the blue quilt, my light color was a very large print. Don't be afraid to use large prints in quilts, especially simple ones such as Irish Chain or trip around the world. Large prints can give a nice lacy effect to the blocks. I think the important thing in picking out fabrics for an Irish Chain is that you have good contrast between your fabrics no matter from what part of the color wheel you pick. Happy quilting.