My design wall is one of the most important and useful items in my studio. I generally create one-of-a-kind wall art that is developed directly on the design wall by 'trial and error.' There's lots of standing back and muttering involved....as well as test photos with the iPhone. It's not uncommon for me to download various design approach photos to my computer to view them side by side. It's such a good way to compare what is or is not working.
I came up with a nifty trick many years ago that I again used on a piece that's currently on my wall. I blogged about it eons ago but thought perhaps sharing it again might be useful.
Sometimes fusible motifs require precise placement. The process of pinning the shape without it attaching to the design wall, then transferring the background (if it's a large one) to a pressing surface can be troublesome as shifting so often occurs. Instead, I dig out my Clover mini iron and spot fuse the pieces in place while they are on the wall before doing a final press at the ironing board. It works great!