...As for modders actually working on the games, why would they want to pay modders when they already have a full staff?
And why would you pay someone who already works for free?
As for modders getting credits in new games for inspiring ideas by their mods for old games; how may modders add a credit to their mods saying something like "I based many of my scripts on scripts originally written by Brian Robb of the Bethesda staff who worked on Fallout 3"?
I am a little confused by the obsession with credit among modders. I can understand why a person doesn't want another modder to copy their mod and put their name on it for download, since bragging rights are really your only payment for offering free mods, but expecting developers of games to give modders credit for games that the modders derived their mods from is a bit convoluted.
While it would be nice if a gaming company would hire someone to make only icons, it isn't likely if they already have someone on the payroll who is multi-talented and creates them as well as other things. And considering the state of the worldwide economy, if I were already working for Bethesda I would most likely be willing to put in long hours to keep my job and prevent any work from being farmed out. Still, freelance opportunities might exist if you pursue them. It isn't really necessary to live in the same city or even the same country as a business if your product is all digital. If you are really interested in making software games for a living, then expand your capabilities with more training. The greatest difference between professionals and amateurs is usually initiative.
http://www.gamesas.com/eng/links/gamesas_jobs.html
The best jobs don't usually drop into your lap. You have to hunt them down like prey.