The Renter-Friendly Upgrade TikTok Swears By For Instant Charm In A Dull Space
TikTok user @lonefoxhome showed off a precut muntin insert that fits right into the window frame and is held by tension. These sets are available from Amazon or Etsy, and are paintable, so you can match them to fit both the indoor color scheme and the outdoor one. You can also do an even more cost-friendly approach by purchasing thin pieces of wood or molding, like these Balsa Wood Sticks from Amazon, then cutting them down to size to create a grid with wood glue. Use strips of double-sided tape to attach them to the window.
You can also purchase muntin sticks from Amazon that already have adhesive backs, or vinyl stickers from Etsy that use static cling like many window films to attach to the glass and create a grid. If privacy is also a need you can also purchase window film from Target that gives the effect of carved glass and ready-made muntins.