Ceramic molds can be fired many times. Must be kiln washed before use.

Step-By-Step: Slumping 3-D Flowers
Step 1. Trace the slumping mold onto a piece of paper, so you know how large your glass can be. Begin arranging glass on this pattern, starting with the flower base glass.
Step 2. Arrange flower petal glass in layers and fuse.
Step 3. Arrange the fused flower on top of the mold and slump.

Images courtesy of Creative Paradise. Last two images display flowers created with this mold.