Selecting backing........

I finally got the other blocks sewn together.  All of the edges are bias so it is going to take some care to keep them square when I baste them.  The next task is to choose the backing.  I want to use the same on both so I pulled out some large yardage pieces.  I'm going to keep looking since I'm not sure about either of these.
The one on the left is soft colors.  The background is a gray-green.







The one on the right is wild.  I can't see using it for anything but a back.  I have some of the wider Kaffe fabrics that are a little heavier weight and they would make these wallhangings really stable.  I need to find them today.