Should I use flannel, batting, or what? I'd like to make myself a design wall...

I prefer warm and natural batting...
I suggest trying several choices, small pieces tacked to the wall to see which works best for you. Lay some fabric on them and see what sticks best :D:D:D

My husband just made me one; he made a frame from 1" boards and tacked Warm and Natural on the front - I love it! I've seen walls made of a piece of batting or felt taped or tacked to the wall, attached to rollers, made of fan-fold insulation. I second amma, see what you like best for stickiness, I find batting is working just fine.

You can use either of those. I am not sure what the pros and cons are all. I like felt. I buy it at Joanns and it is really wide so don't have to seam it.

When I am going other places I have a flannel sheet that I use and pin up for a temporary design wall.

Other people have used flannel backed tableclothes.

I've got 2 yards of flannel backed vinyl for mine that I can hang on the wall, lay on the bed or roll up to keep the pattern the way I want it - very portable. There are so many options and you can really put a lot of money into one or go the cheap route.

Cheers, K

I used a LARGE remnant of flannel-backed marine vinyl. A few tacks and no sagging. I found the cheap flannel-backed table cloths too wrinkly and required so many tacks/tape to attach to the wall. I'm waiting for another remnant to wrap around the next wall.

I used flannel - white. Very happy with mine

I like white felt because it comes in 8 foot widths, so I didn't have to piece it to cover my large insulation panels. Plus it worked out to be cheaper than batting. I like having a pure white to work against -- I think it helps when you're making color decisions.

RST

I use white flannel because I was fortunate and got it for a super price in a clearance sale. I think you have to test to see what you like best.

I used a piece of flannel like fabric I picked up at a yard sale several years ago. I recently got the space to put up a wall and checked my boxes of fabric and found it. I forgot it was there. I was glad it was white. It works like a magnet. It is like flannel on one side and knit on the other.