I hope I'm doing "ok" at tutorials. Sometimes I think I'm as clear as mud! YIKES! So here goes my version of the cracked glass! Hope you like!
Supplies:
Embossing Gun
Neutral CS
UTEE (Ultra Thick Embossing Enamel)
Stamps of choice
Inks of choice to stamp & color (optional)
Staz-On Ink for image
Versamark
Tray (optional)

Stamp image and color as desired (optional step)
next dab Versamark ink all over piece of CS you want to "glass"

in tray, sprinkle UTEE powder. Lift image and shake off excess powder. Put left over powder back into UTEE jar.

begin embossing. Be careful, it could get messy in this part as the UTEE powder/crystals will fly all over the place. If you have glasses, USE THEM or have some goggles at hand. Heat until all the powder is melted.

at the first heat thru, you'll maybe notice some "bubble like" embossing, repeat embossing with a minimum of 3 to a maximum of 5 times. Always rub the Versamark over each step before adding the UTEE.

do this until it's smooth and glossy and stick in freezer for about 10-15 minutes...depending on how thick your UTEE embossing is.

when you bring it out of the freezer, it may be curled...use that to start cracking your "glass"
next, get a sponge, cotton, or dauber to ink up the cracks (optional step)
assemble your card! You're done!

Questions? Let me know!