I can even give You my most recent example:

I am currently working on my little Harry Potter Next Generation project. I was looking for some new characters to introduce; I had some ideas, but they needed one final polishing. Meanwhile, I was listening to some Yiddish music because, let's be honest, I work best while listening to old/weird/foreign music.

I found these ladies. Now, a bit of explanation about the origin of this video:
This comes from a Polish television TVP1. It's from 2008's benefit concert of a famous theatre actor, strongly involved with Warsaw's Jewish Theatre.

If you look at the first lady - Mrs Golda Tencer (who is, by the way, currently the widow after the guy whom this concert was for) - you'll see where I got my inspiration from. The clothes she's wearing, the hair style, the voice and the... ekhm figure... It all resembles what I see as a stereotypical witch character. Maybe even a little bit of what I want Discworld's Nanny Ogg to be.

And so, Mrs Golda, plus a character of Dana from the manga UQ Holder! helped me create my Next Generation DADA professor :D