What decorative shelving can I use in this space to show photos and
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Suggested Project Book
Did you mean to put up pictures? There aren't any and that would help us to give you suggestions.
Head over to a craft or hobby store and you can purchase pre-made shelves. You want to do a bit more diy, purchase decorative brackets and any home improvement center will have a selection of pre-cut shelves in various widths and lengths. You can paint or stain to coordinate with your decor.
If you use glass or plexiglass shelves, you add visibility between shelves, and fairy lights shine farther. ☺️
I like this one! https://www.hometalk.com/diy/decorate/fireplace/iron-pipe-family-photo-display-4551336
Iron Pipe Family Photo Display