Last post got removed. Made some floating shelves out of 2x4 pine and 1/4" maple plywood. There's room for improvement, but I am happy with how they turned out overall. : r/woodworking
How to Install Floating Shelves - Bob Vila
DIY Floating Corner Shelves - Shanty 2 Chic
DIY Floating Shelves: How To Build a Floating Shelf
THIN FLOATING SHELVES THAT YOU CAN TOTALLY DO YOURSELF – With Love, Mercedes