In Geometry Dash, there are numerous unlockable icons that players can achieve by completing specific achievements or challenges within the game. Here are some examples of popular unlockable icons that players often strive to obtain:

1. Cube Icons:

   • Cube Face: A basic cube icon that players typically start with.
   • Wave Cube: A cube icon with a wave-like design.
   • Robot Cube: A robotic-themed cube icon.

2. Ship Icons:

   • Space Ship: A popular ship icon with a space-themed design.
   • UFO Ship: A UFO-inspired ship icon.
   • Dual Ship: A ship icon featuring a dual-color design.

3. Ball Icons:

   • Smiley Ball: A classic smiley face ball icon.
   • Pixel Ball: A ball icon with a pixelated design.
   • Fire Ball: A ball icon engulfed in flames.

Get creative and have fun fundraising for a great cause - getting books into the hands of children who need them.