Cover art instead of folder icons

Ive looked’ but with no luck. I have alot of my movies in actual folders, mostly AVI’s, mostly because i have a part 1 and part 2 of the same film, but the down side of that is that instead of showing cover art for that movie in GRID view’ it shows an ugly folder. is there anyway of fixing this so that all the folders turn into actual cover art? 


much appreciated . 



You can use the techniques described at