Someone asked me recently for some really shockingly intense colours - as she put it - she wants to be seen from down the street :)
There is no doubt that there are tons of makeup that profess to do that but I have seen the stalwarts like MAC, HIP Loreal that can put their money where their mouths are and they can be really intense. The trick is to layer the shadow until you get the level of intensity you desire.
I have seen the matte versions actually stand out better than the shimmery ones...I love the shimmery versions especially for night life, but to each her own...
The good thing about Carnival is that excess is more and there are no mistakes. Makeup is to just have fun and put some swagger into it!