I've mentioned this before, but as I use it to create the stat blocks here, and as it is getting better and better with every new release, I thought I would mention it again. the 5th Edition Monster Generator is an awesome bit of free software that lets you create beautiful stat blocks. It allows for a range of templates (including custom ones) and has a variety of save / export options.
All in all, it's essential for any 5e DM!
Anyway, grab it HERE