To start designing a glass vessel, fill the vase with a base medium such as oasis brick wrapped by clear plastic. In addition, you want to add glass pebbles at the bottom before you add the base medium then add pebbles at side of the container to hide the bottom medium. You also want to have your bottom medium is properly reduce at the sides so that you have sufficient space when you are inserting your materials on the process. Additionally you want to have a base medium higher than the rim of the container to be able to work with a dome shape arrangement easily.
Once set-up you can now get your florist scissors and add greenery by placing the stems as low as you can on the edge of the container completely covering the base.
Next step, you could start filling up your vessel with Geraldton wax with clean stem randomly to create the dome shape that you want. Final step will be adding mini gerberas by starting on the middle and spreading out the remaining flowers to make it flawlessly symmetrical. Now you have a beautiful centerpiece that you can use to the occasions.