Then I came across this post, and had a flash of inspiration.
I had to replace some pickets on my fence because I have a black lab who thinks she's in training as an escape artist, and I bought the 8' pickets from Home Depot, and cut off 12" so I could have a slightly higher fence in that area of the yard.
I grabbed my circular saw and cut 1" strip off the length of each 12" section. Then sanded each piece with my sanding sponge.
I hate nails, so tried to use screws to attach the sections in an "L" shape, and split the wood.. :( That didn't work! Pulled out some small nails and my hammer and, using wood glue, made quick work of the little ledges.
Then I covered with 3 coats of a nice red paint that I've been enjoying.
When dry, I used the same nails, made sure they were level and nailed to my wall.