Okay so these are 1/2 inch, 3/4 inch, 1 inch and a couple of 2 inch plumbing parts, these are all threaded parts that have the raise ridges of a better look.
One could also use them for other areas. Dress them up with some wire as piping and plumbing, some small panels here and there and I think they would look great.
Here I'm using them with the engines for a large looking engine room.
Engineering Room.
Now the parts in the upper right corner can also be used and a small engine as well for a small shuttle or something and seen below.
Now there are some other items added for more clutter.
The blue thing is a wall anchor.
Cap from a toothpaste style chalking tube.
House hold electrical connector.
Cat 5 electrical connector as a computer.
A whole bank of computers.
You can get a pack of 25 for about $10
Here is just shot from different angles of would be engineering room.
I hope this has given you lots of ideas. Many of these items can be used for other terrain ideas as scattered items at a spaceport, crash site or other parts of your ship.
When these things are all dressed up with wire and plastic card for panels and other bits and bobs they are going to look great when all painted.
I know I have enjoyed sharing these ideas.