Lesson #17 - Making a Plaid Background
Choosing a light color from the image with your color
picker, flood fill the new image. like below:
This color came from the lighter area of the
bowl. Now take out your pen tool and set the style to solid line and the
width to 24. Choose a color in the image that you like with
the picker tool. Then draw a line from top to bottom on our new
image. (holding the shift key down while drawing a line will create a true
straight line top to bottom).
You will notice that this line won't go all the way
to edge of our picture, but that is ok. Now choose another color, I like
to use a contrasting color here and draw another line fairly close to but not
overlapping the first line.
Then you can choose another color from the picture
or use a different shade of the colors you have already used. I chose the
dark brown of the birdhouse, and this time vary the width of your lines. I
set my width to about 8 for this one, and drew two lines on one side of our
previous and one more line on the other side.
This is the base for our plaid. At this Point
we need to Merge / Merge All. Taking the Selection tool in Rectangle shape,
Select the area around the lines as close to the outside lines as possible.
Then copy and paste another close to this
area. And Again on the other side. Make sure that the lines are
similar in distance.
Now merge all and crop to have all the
lines equal in size. Copy the image, then rotate left (or right it doesn't
matter). At this point you should have three images, the original Geraniums
tube, the vertical lines and the horizontal lines. 

My finished Product!