2 pointsHere is a simple composite I just did. The AC unit is a photo, the mounting hardware is what we sell here at our company. I do a lot of stuff like this. Disclaimer... the AC part is a Getty Image that my company purchased the rights to, so please don't use this image for any reason.
1 pointYes, I used the S-Scatter tool for those. There are about 24,000. I have a powerful machine. I will tweak my recipe next time, I didn't do enough variation in the scale of the stones. I would do some more texture variation as well.