Great ideas..

I find an art canvas works well covered with flannel...can get in many sizes. I have two 20" x 16" and I can carry them around or you can put a pin or nail in the wall and hang it. When working on small piece complicated blocks, I just set it next to my sewing machine on a small table and can pick up each piece sew and then put back.

I hang a flannel sheet on one wall of my sewing room with push pins. Also you can use the back of a cheap flannel backed table cloth. Either one could be taken down and stored easily. Mine stay up all the time - could not put a quilt together without it! Sure don't need to spend a lot of money to get this done.

I have a lack of wall space. Thanks for all the good ideas!

My design wall is portable. I have a vinyl tablecloth with a flannel back. What I really love about it is the grid on the vinyl is 1" blocks. I attached Skirt hanger with swivel hooks. I can hang it on my curtain in my sewing room. I also have an old Wright's pattern cutting board with 1" grids I can use push pins and can attach the flannel and prop it up on my workbench. I can fold it all up and tuck it between cabinets or behind my 401.

How about foam board? It comes in 4'x8' sheets found at Home Depot.

How portable do you want it. I purchased a sketch board from Hobby Lobby and attached a folded piece of flannel and secured it to the board with small binder clips. It is very portable and large enough for 12 1/2" blocks.

I think that insulation come is the standard size of 4'x8'. It does come in thinner widths but you wouldn't want it to fold and crack. I use 1" thickness.

I used 2 foam insulation boards and purchased a cover from Joanns and it works great.

this is what I used to have but it was on the wall. Now that I'm in an apartment, I only have 1 covered with Flannel and it leans against a wall. I miss having 2 though - much more room for design.