Warning: I am not saying you should do this and if something happens to you while following this instructable, it is NOT my fault. Having said that, enjoy!
Step 1: Materials
You will need:
Thread of the color of your choosing
Alcohol to sanitize the materials
Step 2: Sanitize the Materials
Step 3: Start Sewing!
Make sure to only push the needle in deep enough so that there's a thin layer of skin over it. Be careful not to rip the skin or you'll have to find another spot to place that stitch.
Caution: pushing too hard, fast, or deep will puncture the skin. Like I said before, if there's blood, you're doing it wrong.
Another thing to consider is that what this is is making tunnels in your skin to place thread through. If you remove the thread without ripping the skin, what will be left is a slightly raised tunnel. Not unsightly, but also not pretty.
Here's the link to the video of the red line on youtube: https://youtu.be/duPjXw7KTMI
Step 4: Completed Product!
Update 1: Night of creation. Some of it pulled off of my palm, so I snipped it to prevent more damage.
Update 2: Night After. I added a new design. The line that partially fell off yesterday stayed the same. The part on my pinky ripped when I climbed a wall this morning. I guess it couldn't handle the stress I put on it.