Just saw that Campagnini released some free 3d models / game assets 😀 You can download an empty cardboard boxes & a simple industrial button 🙂 Nice work 🙂

From Campagnini:

“Download those free models for use in your private or commercial work. Available 3d model formats are *.blend, *.ase, and *.obj, the texture map is available in a layered *.psd and non-layered *.png. This work is licensed under a Creative Commons Attribution 3.0 Unported License.”

Empty cardboard boxes

Simple industrial button

Official link