This repository attempts to document every Player Head texture within Hypixel's SkyBlock
These textured were accquired via a NBT Tooltip Mod which can be found here.
Additionally, each skull's value was decoded using a Base64 Decoder which can be found here.
The skins attached to these player heads can be downloaded by appending the respective texture value to http://textures.minecraft.net/texture/ into any browser.
For example, the Auto Recombobulator has a texture value of 5dff8dbbab15bfbb11e23b1f50b34ef548ad9832c0bd7f5a13791adad0057e1b.
By visiting http://textures.minecraft.net/texture/5dff8dbbab15bfbb11e23b1f50b34ef548ad9832c0bd7f5a13791adad0057e1b, its texture can be downloaded.