Can I superimpose one image on another?

[pjw359]

I'd like to view a first and second image in respective levels superimposed, at the moment each image is a background image in a level but I can't see to view them together. My best work around is to superimpose the images using GIMP and then use a single combined usage ... but this is not ideal.

[Puybaret]

There's only one background image per level as you noticed.
You could apply an image as a texture on the top of a thin box. This tip may give you also more ideas.

[DanielJ]

Can we set macraces on this topic? I have a number of identical objects with different variables that will change slightly.