Building tips and tricks: Filling

Just wanted to share some building tips with you all today. Not sure if this is an "official" building technique or not, but it's something I do when making big builds. Typically if I have an overabundance of off-color (bright, mismatched) bricks or plates, I will use them to "fill" up space in the middle of a build. This offers more stability and structure to a custom set but also saves you those precious pieces you need to save for the display angles. Tell me what you all think? Does anyone else do this or something similar? Or is this your first time seeing this? (Also hope you all liked the sneak peak of what I have been working on!)