I just started sewing it together and when I got it wide enough, I started sewing on the end.

I love making my backs with left over fabric from the front. I just make it up as I go along. It usually comes out great. The people I give my quilts sometimes like the back just as much as the front.

If you are sending quilt out to long armer ask if they are prepared to quilt a pieced backing. I know one who after breaking numerous needles refuses to do another one. The needle kept breaking over the seams where the back and front matched . All the layers were too thick. If you are doing it yourself go carefully.
This sounds as if I don't like pieced backing which is not true as I frequently do them.

I usually draw a diagram. It helps me to see it rather than going through a bunch of figures.

Keep in mind that more seams in the back can be a problem--on the long arm seams can cause problems if front & back line up on the seams. Also, if you want the back pieced design to line up in a specific way, you need to be very accurate--mark both top and back centers with a pin woven it it (alert your LA) so that it works.

I found this thread extremely helpful. I made a baby quilt recently and had some Sesame Street fabric that would work, but doesn't match eachother. I think I'll use the biggest piece and add a strip of solids that I used on the front. I've not pieced a back before, but this would be a small enough projects to try it out on!

I have a question about piecing the back of a quilt? I have pieced a back with large squares, if one pieces the back with small pieces won't that cause a problem where the needle will need to go through possibly very thick/hard seams?

You are getting a lot of good ideas on the board. I made a scrappy for my granddaughter's wedding
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Then I pieced the back of it with many of the colors on the front

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There's also another free Craftsy class called Creative Quilt Backs, taught by Elizabeth Hartman. Loved the class. She is an excellent teacher and the technique is fun.

If you have one fabric that is dominant but need to add to make it the size you want it to be, I follow this rule: add the extra fabric to the center and then use the dominant fabric for the sides. Never add a strip to the edge! you will not be happy if your binding gets in the way of that strip of fabric on the edge. hope that makes sense!