I am a pretty big fan of making my own costumes, so I decided to make my Glinda costume, starting with the crown.
Step 1: Materials
A tape measure
Two flexible plastic cutting mats
A hot glue gun
*I had planned to add other embellishments and paint the crown, but I chose not to do either so disregard the extra materials pictured.
This will take about 45 minutes to make and cost about $5.
Step 2: Connect Mats
I decided to sew the mats together at first, but thinking back, I'd suggest just hot gluing them together at one end. If you do want to sew them, I'd suggest taping one of the mats to keep it out of the way as you sew (see pictures).
Step 3: Create the Points
Step 4: Attach the Forehead Piece
Step 5: Sparklify and Bedazzle
I outlined each of the points with glue and added glitter. After that I added rhinestones to the forehead piece and one to each point. I added rhinestones sporadically to the rest of the crown and to the entire bottom of the crown. Then, I made diagonal lines like the ones on the real crown. After I had all the rhinestones attached and all the lines drawn in tacky glue, I sprinkled glitter all over the crown.
I did this after I applied the rhinestones so that the glitter would stick in any gaps between rhinestones on the forehead piece.