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You can use puffy paint or some regular acrylic paint to add interest to your quilling earring pieces. Try adding some polka dots around the edges or paint over the entire piece with a solid color. If you want to add some fine details, you can try painting them onto the quilling pieces, such as a word or initials or some small flowers. Use a fine tipped paint brush to make it easier to create small designs on your quilling pieces. You can also glue some beads and/or sequins onto your quilling piece. Try adding a border of beads to the bottom edge of a dome shaped quilling piece. Or, add some sequins around the top and side edges of a flat quilling piece to add some sparkle. You can try adding other notions to your quilling designs as well. For example, if you think some small pom poms would look cute, then glue some on. If you want to add a button, go for it! After you have made your quilling pieces for the earrings, you can either glue them together or string them together. The way that you connect your pieces depends on the types of pieces you have created.  For example, if you have made a couple of different sized cones or domes, then it would probably be better to string them together using a needle and some nylon thread. For flat pieces, it may be easier to glue them together and let them sit until they are dry. You can glue together different sized coils together inside of a large coil, or glue a few different pieces together to form a shape, such as a flower. However, you will still need to add a string to attach the quilling earring pieces to the earring hooks. If you have multiple pieces that you want to hang from the earrings, make sure to string them together in the order you want them to appear. When you are satisfied with your quilling earring pieces, you can either attach them to earring hooks or studs.  To finish hook style quilling earrings, insert the top part of the string through the hoop and tie it to secure the quilling pieces to the earring hook. To finish earrings on studs, glue the quilling piece to the earring stud and allow to dry for several hours or overnight.

Summary:
Paint your designs. Add beads and sequins. Glue or string multiple pieces together. Attach earring hooks or studs.