Displaying Components in Color in a Drawing

Hi everyone

I create custom plastic packaging and for my drawings I look for a way to highlight the clients' pieces on wireframes and shaded images.
Currently I use a red layer, but the result is not always very clean.

I would look for a way, perhaps through display states, to have a color difference between my packaging and the parts, especially also on cross-sectional views.

Below is an example of the current one:

Thank you