To start you need to cover your bangle with a coat of acrylic paint. This gives it a good base.
Stamp your chosen design on 3 different colours of tissue paper with Archival or Stazon.
Rip these into random shapes and sizes.
Water down some PVA glue in a pot and paint onto the bangle in sections, apply the pieces of tissue paper, overlapping slighty. Coat the top of the tissue paper with the PVA.