This object was made in Tinkercad just to try it out :D. 

Edit it online https://www.tinkercad.com/things/2XZOjs87hNn

My niece is (was) a little bit afraid of bigger cameras. So I made a little bear to put on the lens. I hope this will take her mind off the camera (Now: she directly wanted to play with the bear and was not afraid of the camera anymore. Still now she always searches for the bear when I visit her). 

The hole diameter of this bear is 68mm. The SEL55F18 which I'm using for portraits has a diameter of 64mm. I used some foam between lens and bear to avoid scratching my lens with the plastic. Also  fits on the SEL28F2.

For colours I used simple break commands (filament changes). It is designed to enable multiple colours separated by layer height.

Complete model size is about 166mm x 154mm x 13mm. Printed on Original Prusa Mini

Edit: I've made some smaller modifications on this model and also added 2 versions without hole in it. So anyone can make a new hole for the proper lens diameter into it.

Print Settings

Printer Brand:

Prusa

Printer: 

Prusa Mini

Resolution:

0.2

Infill: 

15%

Filament:
Prusament & Ampertec PLA Black, Grey, White