While the etching cream is drying, sketch the silhouette of a skyline along the length of a 8-1/2” x 11” sheet of paper with a self-adhesive backside. Make it unique or draw the skyline of your favorite city. Use a utility blade like an X-Acto knife to cut out the shape.
Trim windows and doors into the skyline using the fine blade.
If you find it hard to locate a full sheet of adhesive paper, you can also create your skyline using plain paper. As such, you would use spray adhesive to mount the plain paper to the glass jar.