Matching?

How can you tell what kind of background to use with a render? It's so hard for me to tell what matches with what so if you guys can help

 

We have to know what the render is first. Lol.

 

... was talking about in general

 

The colors blend well/no things are clashing with the render etc.

 

Ahh i know that but again in general

 

that was being in general .

 

ohhh i thought u were talking about my sig...