dhananjaysingh

Using this plugin you can associate one image with each of your category created in wordpress. and you can call that image by using provided function in any template file 
 tejus_dj_getcatimg($catid) 
call this function in any template file it will return url of that image. 
where $catid is category id of that category. 
my facebook profile : https://www.facebook.com/dhananjay.singh2 
my company website: http://tejuscreative.com/

category image

Using this plugin you can add images to categories

YAHMAN

Add Categories and Tags to Pages.

category image vs Pages with category and tag