I know I have seen this thread before, but I just can't find it or may have even mistaken it for the Badges thread. 

Rank icons must have equal dimensions, but is it best to do 50x50, 100x100, 200x200? 

Is there any general consensus here? For my site it might look just a little bit different but I don't think it changes much from IPB to IPB. 

Our default SVG images are 150x150 px, if that helps your decision.

Is there any place to get more pre-made badges (maybe the IP ones)?  Thanks.

There are no others we provide than the stock ones unfortunately