I think it's a requisite that Amigurumi crafters make an Ami Donut at some point:
I sewed them all together rather than using glue (as the pattern says). I
did the 'chocolate' swirl with surface crochet, but be careful if you do
this, it makes the frosting quite stiff to work with.
Ami treats for my ami unicorn
I want to make more in future with a better quality yarn; there's a lot of possibilities for variations in decoration and colours (I'd also love to make a huge one!).
The Donut pattern is in the Lion Brand Archive (you'll need an account to view it).
The Unicorn pattern is by Dawn Toussaint.