For backing, have you ever used.....
 

....The plush throws or minky-type throws sold in dept stores that might be used for quilt backing instead of quilting cotton or flannel? These are so cheap compared to $10+ a yard! Quilting with these types of backings, what kinds of problems have you encountered and worked through?

keeping the layers even and flat so the back doesn't bunch up.

I used a micro fiber blanket for backing on a lap quilt, and even tho it is warm and cuddley, it was almost impossible to keep it from bunching up. I pinned the h*** out of it and still ended up with tucks and ridges. We don't really mind tho because it is on the back so you don't really see it and it feels good. Would be different if it was not just for our personal use.

I've read that the minkee is hard to work with. No personal experience, however.

I put Minkee on the back of a baby quilt and sent it to a longarmer. It stretched when the LA put it on her frame. The quilt started out square and was more of a rectangle by the time it was done. However, the person who had commissioned me to make the quilt didn't mind at all.

The minky really slips and slides around alot. I found the best thing I can do is pin, pin, pin! I have pretty good patience, and sometimes I get a little frazzled. They make such cozy things, its hard to resist using it. LOL!

I have used fleece and minkee. I love quilting it.

I've used the fleece blankets and had no major problems. I do tend to pin it a lot though. You do have to be careful not to stretch it too much.

Pat

With minkee, I've seen people put pics of quilts up here with it on the back and were quilted on a longarm. They looked good. I haven't tried it personally yet.