The best replacement for stencil is wallpaper.

The best alternatives to stencil are rated as following:
★★★★★  wallpaper
★★★★  screen printing
★★★  decal
★★★  template
  freehand

Your alternative for stencil is not listed? Suggest!
Speaking about stencil, one probably shouldn't forget about spray paint.

Other search terms related to stencil and their ratings are:
★★★★★ spray paint
★ painters tape
You have in mind a companion for stencil and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of stencil in all years. Click on graph for more.
stencil
wallpaper
screen printing