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Show off your collectibles. Use mirrors. Add texture with 3D effects. Create a tapestry effect.
Put in shelves along one long wall, and you've got a great place to show off your collection. Use several rows of shelves in a single color to pull the look together. Mirrors can make any space look bigger because they reflect light and space. Try adding repeating mirrors in a decorative shape, such as a series of oval mirrors in a row or a repeating pattern of diamond-shaped mirrors. When you're decorating a wall, you're likely to think of 2-dimensional art, such as prints and paintings. When all your decorations are flat against the wall, the effect can be flat as well. However, adding 3D art can give the wall texture and depth, making it more interesting, because it pulls the decorations partially out from the wall..  For instance, try displaying a collection of plates that come out from the wall, or use large fake silk flowers to cover part of the wall. You could also hang thin decorative lights from the ceiling near the wall to bring the decorations out from the wall. Paintings that are partially sculptures, meaning they have 3D aspects to them, also work well. Hang a tapestry on the wall for a dramatic effect. You can even use a decorative rug on the wall as a tapestry. However, if those options are too expensive, opt for a decorative (hemmed) fabric or even a cheap sheet. Keep in mind that larger prints will work better for a wall. Also, be sure to iron the fabric first.  You can use a tapestry rod to hang it, but if you want to go cheaper, try painting wooden dowels from a home improvement store. Create a sleeve at the top and bottom by simply turning the edge over and sewing across or using fabric glue. Insert the rods, and hang the top rod from hooks. Another option is to staple a piece of fabric over a canvas.