There was a list of 500 Hebrew list. I took the English part off, and I started looking up every Hebrew word, then either finding an image for it, or making my own. Like the Louis CK's "but maybe".
I had some for Russian, German.
Some for physics, microeconomics, etc.
Otherwise, I have a Greek alphabet deck I like to review, and a bunch of basic math stuff (pre-algebra, algebra, trig level stuff) just to help keep that stuff in mind.