As stated in the post (https://forums.gamersfirst.com/topic/6187-halloween-costume-contest/), and i quote:
"You can ONLY use the three colors presented above in your design. How you choose to use them is up to you!"
and to solidify: "You are only allowed to use three colors Orange, Purple, and Yellow"
The suggestion here being, only use the colors as presented above. Which implies the colors as quoted in the replies as being;
"- Orange: 2,7,10
- Purple: 25,7,8
- Yellow: 6,7,8"
If it were a suggestion, please specify that this "suggestion" is open to personal selection within THAT post.
So, yes. They are limited. To say otherwise, is to go against the rules as stated. Give us the creative freedom that is APB.