The Icons I use on CryptoGermany are made by a very talented guy named Paul Davey.
He called them “Buuf” Icons. They are similar to the GANT Icons, which might or might not be familiar to you.
I’ve always loved the style of those Icons, which I went on to ask him, if I am allowed to use them on my blog. And he was very kind to accept.
Check out his Artpage on Deviantart.com: http://mattahan.deviantart.com/
Very talented guy.
If you want to use these Icons as well, I can send them to you, but you would need to ask Paul Davey yourself. It is part of the legal notice, to ask him, before using them. Especially commercially.