Quoting Dean Winchester:" thank you i want to do stuff similar to this "
Oh! Okay I thought it was a company that made bedazzled phone cases. hehe
I'm fairly certain the special adhesive at Michael's would work. I remember looking all of that up because I wanted to put a few big pieces on it but ended up doing little designs. Super Glue dries too fast. Hot glue dries fairly fast too and it might melt the plastic case. Not mention hurt your fingers trying to get the pieces on and in the right place.