I stumbled upon PureRef, a neat tool that makes it easy to create collages of reference images. Just drag your images into it and arrange them any way you like. Give it a try and let me know what you think! PureRef is freeware and available for Windows, OSX and Linux.
from BlenderNation https://www.blendernation.com/2018/11/21/pureref-freeware-reference-images-manager/