whether it's better to stamp or stencil (or other) an image onto small muslin gift bags, like these. Is there a particular method or ink that will work best? I'd love to use soy-based or other environmentally friendly ink.
I think it really depends on how much detail you want your image to have. A stamp will give more detail than a stencil. You can use ink on fabric and heat set it, no guarantee it will be permanent unless the ink is specifically made for fabric. You can add textile medium to paint to make that permanent. I like to paint onto a stamp and use that on fabric. Just be sure to put a piece of cardboard inside the bag so you don't bleed ink/paint through to the back.