Almost always pieced!!! I posted this a while back. There are some great ideas here.

http://www.quiltingboard.com/picture...s-t148395.html

I like to make the back as interesting as the front and one way is if I don't have enough of the backing fabric, I lay it diagonally and add contrasting triangles. I think it works nicely for kids' quilts.
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Here are some sewing options.

Jan in VA

All the time. The extra wide fabric doesn't come in enough patterns to suit me. I rarely use a solid fabric either--can't hide your mistakes. It's your quilt, do whatever suits you.
Sue

auntpiggylpn, I love the backs of yours. Great ideas!!

I also use the diagonal piece -- if I am doing a small quilt and have enough lenght in my fabric piece. I use the John Flynn method and I have been very happy with the results. I have done this with small prints and larger prints and really like it. Ihave not done it with larger quilts -- though I may have to do it for my son's quilt since the back I want is 90" wide and the quilt is 110" wide.

http://www.flynnquilt.com/media/uplo...onalpb1103.pdf

http://www.multi-patch.com/html/fabric_calc.php

My problem is I drive myself nuts trying to keep the back seams away from the front, this works better for me.

Craftsy has a free class on creative quilt backs. Might be an opportunity to see if you like their classes before you purchase one, but don't know if you have to be a member or not. I've been pleased with the ones I've taken...
http://www.craftsy.com/class/creative-quilt-backs/117

Great ideas, everyone! And Artsy, I love your example.

I have pieced a lot of backings, this is one I just tried with diagonal stripes.

I just recently did a pieced quilt block. I googled "pieced quilt backs" and looked at imagines to find one I liked.