Stickers normally come with Swann Security packages to place around the house, but they don't last long so i remade made one in Fusion 360 to place in the windows.

Could be placed outside around the house if you use the right filament.

Dimensions are 70mm x 100mm x 4mm

Print instructions

Be sure to print in suitable materials to combat sunlight exposure.

The G-Code attached is set to change colours. Its for PLA but you can always change this and preview the colour change again.

The colour change happens at the 2mm layer height.