Hope someone can help me - I recently saw a tutorial on FB that showed how to make a screen for use with airbrush to decorate cookies.  They used an embroidery hoop and plain lace background.  Thought I had saved it, and it's not here - and now I need it!      Is anyone familiar with the technique I've (sort of) described, or the tutorial?  Thanks in advance!  

Though not on Facebook, this one from Montreal Confections on YouTube sounds very similar to what you describe:

THAT'S IT!  Thank you so much!!!!!