I noticed when I went to print a balloon for a friend that a lot of the available models were somewhat abstract, and I wanted to go for a more realistic approach. 

My main prints (red and green) have been at a .28 layer height iirc, and I tried Cura's version of vase mode with the white balloon. With some tweaking of settings, I expect you could get really effective vase mode prints of these but I haven't been able to yet.

I recommend orienting the balloon with the mouthpiece down, directly onto the build plate for the larger size of balloon. YMMV with the little guy. :)