This is pretty cool.

• DIY ear plug kit. I used the Radian brand .
• In-ear headphones
• A hobby knife
• Clean ears and hands

Read the rest here:

http://www.howtogeek.com/57481/how-to-make-custom-silicone-ear-molds-for-your-in-ear-monitors/

via

http://lifehacker.com/#!5787610/diy-custom+molded-in+ear-headphones