Colors i MIGHT add:
Black
White
Gray
Hazard Barrel
Light blue
Lime
The most likely (i'd say) are lime, black, white, and gray.

Nevermind I can confirm these colors will be coming in a update:
Light blue
Lime
Black & White

POSSIBLY Hazard barrel.

I'll get back at work on the mod later, but for now im going to start working on another mod i had a idea for.

However i will try to update this whenever i can.

Expect a update sometime this late week. Friday-Saturday/Sunday. Adding:

Brown
Dark Red
Fixed Red (It looks alittle to pink for my liking.)
Water Barrel
MAYBE oil barrel

Not 100% guarantee it will come out this week but i will try.

Forgot to mention:
Also all add barrels (new and old) will be in a new catagory to help find them easier.

Expect a update soon! Alittle after this upcoming update i will remove unneeded files and stuff i used for testing so it takes up less space, even if alittle. With that being said, wheres the barrels:

Brown
Water + Oil Barrels
Dark Red
A more red barrel
Tweaked hazardous waste barrel texture, alittle green goo is peeping out
Greenish-blue barrel
Maybe more but i dont have any plans. At most by tomorrow is when it will be finished

Added all the colors and some cool textures i wanted to.

Funfact: The ONLY reason I created this mod was because i needed a brown, red, and pink barrel for a ship.

SO, the current mod im working on won't be AS VANILLA as this one. It will be abit more android based than human based, but there are humans and even a 'robot' gorse. hopfully you're looking forward to it!
I cant say when it might be finished tho.