Open it in Customizer and change the text to create your own tag.

\u2744 in the first line is the "snowflake" code point. You can find more symbols here: http://www.charbase.com/. Can use any unicode codepoint from U+0000 to U+FFFF.
Especially this two pages contains many useful symbols:
http://www.charbase.com/block/miscellaneous-symbols
http://www.charbase.com/block/dingbats

some examples:

\u2744: ❄ (snowflake)
\u2661: ♡ (heart)
\u263A: ☺ (smiley)
\u2740: ❀ (white florette)
\u262F: ☯ (yin yang)
\u271e: ✞ (shadowed cross)
\u2714: ✔ (check mark)
\u260F: ☏ (telephone)
\u2708: ✈ (airplane)
\u2709: ✉ (envelope)
\u270a: ✊ (raised fist)
\u270b: ✋ (raised hand)
\u270c: ✌ (victory hand)
\u2710: ✐ (pencil)
\u2603: ☃ (snowman)
\u2602: ☂ (umbrella)
\u2620: ☠ (skull and crossbones)
\u2615: ☕ (hot beverage)

This is a simplified version of Customizable Multiline Tag or Keychain please refer the description here for more information.

Prusa

Prusa Clone

No

No

0.3mm

20%

I have changed the colors after 1.8 (6 layers), 2.4 (8 layers), 3.0 (10 layers)

The colors:
layer 1 - 6: white
layer 7 - 8: gold
layer 9 - 10: silver
layer 11 - 12: red

The 3rd Image shows the layers of the Felix tag.

For slicing I have used Simplify3D with this post processing script:

{REPLACE "; layer" "M117 Layer"}{REPLACE " Z = " " Z="}{REPLACE "\nM117 Layer 7, Z=" "\nG1 X10 Y5\nM0\nM117 Layer 7, Z="}{REPLACE "\nM117 Layer 9, Z=" "\nG1 X10 Y5\nM0\nM117 Layer 9, Z="}{REPLACE "\nM117 Layer 11, Z=" "\nG1 X10 Y5\nM0\nM117 Layer 11, Z="}

You can a very good description in the Simplify3D group: Simplify3D Color change, filament change, pausing