When I first started designing ~15 years ago, I spent hours trying to create banners completely from scratch, drawing all the shapes by hand. I always felt that I didn't want anyone else to ever be able to claim that they helped me with my art, so I had a personal policy (from a very young age) that EVERYTHING I CREATED WOULD BE 100% ORIGINAL.
After spending hours trying to painstakingly craft my own original images, I was told that I was doing it wrong and taking way too long. I was tutored in the fine art of grabbing pictures from the internet and then cropping, rotating, stretching, etc. to fit the design you are trying to create in Photoshop.
Although I felt a little like that was cheating, I discovered that it was a common practice at the time (2003), and in work situations that was often what was expected of you to produce work in a timely manner.
So, you can see how I started believing everything must be created from scratch or you are a thief and not as good as somebody who CAN create from scratch. Eventually I was exposed to the concept in business of "don't reinvent the wheel", meaning to use the tried-and-true concepts and components that already exist rather than trying to build everyhting from scratch. Now I have a more "middle-path" understanding that sometimes it can be quicker and useful to go grab some Creative Commons (0) image from Google or Pexels or whatever, than to try to find a way to set up a shot and photograph the scene myself.
So, what would be an accurate term for someone who takes art created by others, then makes something new out of it?
Since these are called "derivative works" (especially in a legal sense), perhaps the term "derivative artist" would be appropriate? But, I wonder if there is a catchier, more buzz-worthy term that those in the professional design business use that I am just not aware of?
EXAMPLE: One prints out a photo of a starry sky from the internet, cuts it (with scissors) into a square, and then makes an origami crane out of it.
EXAMPLE: One makes a collage of CC0 images found on the web.
EXAMPLE: One attaches a calculator and two bicycle wheels to a small wooden box.
In all the above examples, something new and unique is born from the artist's arrangement and editing implementations.
NOTE: Cynical words like "plagiarist" or "thief" are not what I'm looking for.