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Decorating with a collection of frames can fill a large wall with interest. Paint them all the same color for a unified look and add to the collection as you find interesting and unusual frames at tag sales and flea markets.
Brightly colored 60s cookware and dinnerware makes a lively collection for the kitchen. Don't keep interesting pieces hidden in cupboards. They can be used them to add a personal touch to lots of kitchen designs.
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Find creative ways to display collections, like this large collage of travel photos from Apartment Therapy trove of decorating ideas for living rooms. Small format photos or art look great hung together on a gallery wall too.
Create a cabinet of curiosities with your various collections. Cabinets of curiosities were popular in the Victorian era and are just as interesting today. Glass front cabinets and bookshelves work well to house collections and curiosities.