"Forum Contains New Posts" text color/

[daax]

I have a question on a similar topic. 
I am using Flatty theme. 
forums - http://phinnykills.com/forums

I want to change the post & new post icon. 
See attached pic of what they currently look like.

Can anyone tell me where those image files are located? 
I've searched everywhere and cannot find them. 

I figured i should be able to replace them with my own image files, once i find them. 

Thanks