I used a cleaned frappuccino as a vase. Because I didn't want the pens to be seen I painted the inside first. This is optional depending how you want it to look.
Once the vase is ready measure how big the vase is and the fake flowers. I taped the fake flower onto the pen so that only the stem was sticking out.
Do the 3rd step as much as you need to. Be sure to put just enough.
Place the stems in the vase and you're done!