Take a look at a seam/stitch alpha/brush set by Jonas Ronnegard.
Take a look at a seam/stitch alpha/brush set for ZBrush by Jonas Ronnegard. The pack features 35 brushes and height/alpha maps, all 1024×1024 or 2048×2048 in Tiff, PSD and ZBrush brushes.
You can use the set for commercial projects, but not for repackaging, reselling or sharing with other artists.