i build them with google blocks. I just try to learn it. Blender is to complicated for me. I think for blender i need more time to get use of it.
By the way: you can change the colors after places the objects.

Your objects were way too good not to use, amazing work. I plan on using more of them in future layouts too, as to me at this point they are practically a necessity

great to see you used some of my uploaded objects :) I will upload them again (and many more) if the previews will be better. The last update fixed some points but its not as i want it to be. I hope Eric make some changes for it with the next update.