I usually make fudge, lots and lots of fudge. I too did the cookie mixes one year but will not do that again the cost of mailing it was crazy.
Since you have done the flavored salt what about vanilla sugar with a recipe or two how to use it.
I have a "house blend" of seasoning that I use on most everything it's a salt, pepper, garlic, onion mix we like the ratio of I keep it on my counter you could mix your own put it in small crocks for a gift.
You can make infused vinegars or olive oil too.