Love! This link is not in English but it looks as though it is a matter of sponging or dabbing black textile paint through the lacy part of a doily to get the frame effect. I think one of those cheap plastic doilies would work perfectly as a stencil. TVL
Painting on foil--add dish soap to paint to help it stick. This would be a new idea in my classroom. I would embellish the project by having my students take portions of the foil and engrave designs on them, or rub textures onto the surface. That would make something interesting. Perhaps there is a Christmas project in there somewhere.