A scant 1/4" was my only choice. I pressed my seams open and quilted on them in a grid pattern, as well as through the middle of the snowball using a medium broken zigzag stitch. That way, any stray or loose linen edges are sewn down on the inside - and the seam is really secure.
Amy Butler / Gypsy Caravan
Natural Linen IL090 from Fabric-Store.com
Warm & White twin sized batting
Aurifil 50wt. Light Sand 2000 for piecing & quilting
Accuquilt Snowball die
Faultless Starch (lots)