As far as I can tell, there is a way to change the text and the background, but no easy way to change the loading icon: Babylon.js/babylon.loadingScreen.ts at 263b0638b78a37e62263c8719849b2dc517ff45e · BabylonJS/Babylon.js · GitHub
How would I go about adding a custom logo?
Here we are: Babylon.js Documentation
Was hoping there was a way to change the logo as easy as the color or text. 
Thank’s!
The idea behind that decision what to find a way to get the logo visible as a way to let users know about babylonjs as the main issue of Babylonjs is that developers do not know it:)
Do we let J “sneak in”?
https://www.babylonjs-playground.com/#5Y2GIC#1
Wait a few seconds after load… and the loading graphics will turn-on for 10 more seconds.
Lines 2-52 need to be included in your project… at the top… like shown.
JS version of code was copied from https://raw.githubusercontent.com/BabylonJS/Babylon.js/master/dist/babylon.max.js (a pure-JS non-compressed version of latest BJS).
Line 36 uses a URL, in this version. Be sure to give BabylonJS a little “exposure” when/where you can.
I think @Deltakosh is in France right now, marching with the yellow-vests (j/k), so he understands the occasional need to adjust “establishments”. 
Would that be called “Macron-management”? (ar ar ar) (blague française)
Oh but I’m ok for any adjustements I was only mentioning the reasoning behind the API choice