If you take a picture of the render, the lighting/coloration might be off. That's not saying it is a bad idea, and I have done it before. But there is a perfectly good way to get a great angle in game. First, go to a single player server in either the Construct, Greenscreen (or Slate Green) or Bluescreen maps. Then build a tower that is about 10 bricks high out of 1x1's. Put a platform on top. Set all of these to no rendering. Go into F8. Find a good angle (Easy to do now). Take picture. Cut out green/blue/white, replace with trans, merge with the icon.png. Save. Put in .zip. Test. ???. Profit.