nextgen writes:  

I have added a set of over 30 Topic Icons to the downloads section that are 70 X 70 in size and should match the SimpleBlue theme in Ravennuke pretty close. Included is the psd so you can create your own for categories that you may have on your site. Please visit http://www.ngnuke.com and register to download the icons. I will be making other matching icons for the other ravennuke themes as the weekend passes so if you need a vertain set made just request them and i will get them done directly.

Thanks and Merry Christmas,
nextgen (george)
http://www.ngnuke.com