BIONICLE Skin

You need to have 10 Thornax, which isn't hard to get, considering that Thornax Plant Modules are cheap to build and grow Thornax quite quickly.

Trade Atakus 10 Thornax for the BIONICLE Skin blueprint. Build it and go to the Page Builder section of your private page. Finally, go to the Edit Background section and change your skin to BIONICLE. Now your page background looks like the BIONICLE Networkers' pages!