Today I learned what a kenning is. I have encountered them many times before (to a foreigner, Finnish seems chock full of them) but I never knew they had a name. I love them!
As an aside, a fun exercise (for some values of fun) is to come up with English compound words that are not compound in Finnish. The first one that comes to mind is "lighthouse" – "majakka" (borrowed from Russian маяк).
But my favorite neologism for "computer" is probably the Icelandic tölva, a portmanteau of the words tala (number) and völva (a prophetess in Norse mythology).