Electrical tape is a Plasticized PVC film with an aggressive rubber resin adhesive in OSHA colors for cable coding, quick identification of electrical phases, circuits, feeders and branches. It is also flame retardant.
I have used electrical tape to decorate both glass and plastic containers. Unlike duct tape which shows only grey adhesive on the inside of the container, electrical tape has a clear adhesive so the color of the tape shows on both the outside and inside of the container. It is easy to apply and remove so you can decorate or theme the same glass or container over and over again. Fun for holidays, birthdays, showers or any event you want to decorate with a theme.
Here are some various plastic and glass cups before decorating:
Here is a few designs you can create in just a few minutes using electrical tape.