a mod
i can't find the link sry

Here's a link to the mod that BlasterUK mentioned
http://www.lancersreactor.com/t/Download/Download.asp?ID=1730

I have to tell you though that a lot of the screenshots you see of in game goodies are edited with programs such as InfanView, Photoshop, Paintshop, and other software depending on the effect that is trying to be achieved. I say trying because we're not experts at it.

Is says its an addon, how does that works, i normally only use General mods. is this just the same by clickin on them en they will open?

Addon just means it don't add a lot of goodies to the game.
A lot of Addon type mod's are compatible with other mod's as long as they don't change the same files as the mod you already activated.

As long as the file (mod) has the .flmod extension the mod manager will know it's suppose to handle the extraction of the files when you double click on the file name so you can use the mod manager to activate and deactivate mod's.