This is almost my same circumstance right now. I have a new adopted baby in our group of friends. So I decided for his first quilt I would purchase the new blue fabric group from Connecting Threads and make the disappearing hourglass quilt that I have been wanting to try. So I purchased a layer cake and 1.5 yards of the white from the line. I ironed and starched the layer cakes and have starched and cut the white into the matching 10" sq. So everything is now 10 sq and stiffly starched due to the bias cuts. I figure if they shrink or whatever, they will all do it the same way, time, amount, etc. HTH
Be sure to post pics when you are done.

Here's some facts: I washed and dried a jelly roll in a lingerie bag. It was extremely hard to iron those strips straight, but with a lot of patience they turned out okay. I think I would consider the colors in the fabrics, any red? Also, the manufacturer?

I'm one of those who washes and starches every piece. With jelly rolls, I put them in a mesh bag or pillow case (with a scrap tie) and toss them into the machine. (I've even used old panty hose as a bag) I starch them bag and all with stay-flo and then take them out and lay on a towel to dry. However, I do press them when they are still damp.

Color catchers always go in with fabric in my world. Smoothing them up on the towel helps the pressing process.

I couldn't have said it any better Dina.

I would never wash a pre cut. I would have to press them one by one.

don't wash, love the sizing in it

My LQS owner told me that quality quilting fabric doesn't need to be prewashed unless you are super sensitive to dyes, etc. She said that today's manufacturers are very particular about making sure their fabrics won't bleed onto other fabrics. Batiks are another story, however. So, I don't always prewash everything. If I buy anything at a yard sale or someone gives me fabric, I wash that just because I don't know how old the fabric is.

So, I wouldn't prewash the items you're using.

I'm with the don't wash group. I never wash unless it was given to me or I bought it at a garage sale or thrift store or batiks. As of yet I've never had LQS regular (not batik) cotton fabric run on me. I have tried to wash a jelly roll once, never again. My opinion only.

I was in that same predicament when I bought my first jelly roll. I found a pattern that only needed the one jelly roll but then realized I needed backing and binding and I only had prewashed fabric. so I bought more for it and quit prewashing. Now I only prewash if I'm making a bag or some other thing like that.

If you are going to wash the jelly roll, put it in one of those mesh laundry bags for delicates to prevent some tangles