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When it comes to decorating, less is often more. If you add too many decorations, your coin purse will look cluttered and messy. Instead, choose 1 or 2 decorating methods. Be careful not to cover the zipper teeth, however! Find a ribbon wide enough to cover the zipper tape. Hot glue the ribbon around the top edge of each bottle half, just below the zipper teeth. Cut the ends of the ribbon and glue them down. Make sure that you are gluing the ribbon to the outside of the bottles, otherwise it won't cover the zipper tape. Find some patterned washi tape that is wide enough to cover the zipper tape. Wrap it around the outside of the bottle, just below the zipper teeth. Cut the end of the tape, and press it down. Do this for both halves of the coin purse. You can find washi tape in the scrapbooking section of a craft store. Buy a set of large googly eyes. Hot glue them to the top half of your coin purse. This works great for green coin purses--it will make it look like a frog! Give your coin purse more personality by hot gluing felt shapes to make a mouth or ears! Buy a pack of stickers from the craft store. Choose a few stickers that you like, peel them off, and press them against the coin purse. Simple stickers, such as hearts or stars, work the best. Get a pack of rhinestones from the craft store and glue them to the coin purse. Super glue will work the best, but you can try using small amounts of hot glue as well.  Experiment with large and small rhinestones. You should glue self-adhesive rhinestones as well. The adhesive is not very strong compared to super glue. Buff the surface of the coin purse with fine-grit sandpaper. Wipe the surface down with rubbing alcohol, then paint it using acrylic craft paint. Let the paint dry 15 to 20 minutes, then add a second coat. Let the paint dry completely before using it.  A fine-grit sandpaper that's between 120 and 180 will work the best for this. Buffing the coin purse will give the paint something to stick to. The rubbing alcohol will clean it and help the paint stick better. You can use spray paint, but close the purse first. Be aware that this will also change the color of the zipper. Wipe the surface of the coin purse down with rubbing alcohol; this will help the ink stick better. Draw your desired designs using permanent markers on the outside of the coin purse.  This works best on clear plastic; permanent markers are translucent. You can try using paint pens on colored plastic, but be aware that the paint may bead.
Choose 1 to 2 decorations for your coin purse. Hot glue ribbon to the edges if you want to hide the zipper tape. Use patterned tape if you don't want to use ribbon. Hot glue large googly eyes if you want a cartoon effect. Decorate your coin purse with stickers if you want a colorful look. Glue rhinestones to your coin purse if you want a sparkly look. Paint the coin purse if you don't like the color. Draw designs with permanent markers for something simple.