How to decorate a rubber iPhone case?

I bought some iPhone cases from target they are belkin but I think they are to plain. I tried to decorate them with nail polish and mod podge glitter on to them but once the polish and glue dried it fell right off. Any ideas on what I put on them to make them pop. I would prefer ideas with glitter but if not that's okay.

Use nail polish. You could do designs or even write an inspiring quote with nail polish on the case

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