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My MIL gave blouse piece,haldi kumkum and some inexpensive gift. You can give anything depending on availability. If you have the above,you can give them. Small gift could be anything like small steel bowl or even scented candles.
I recently did baby shower for my SIL and I wanted to give haldi kumkum but didnt find it in store. Their guest list was 75!!
So I got small party favor bags for 69-89 cents. Then in each bag, I put 1 banana and 1$ scented candle which come in glass jars. All of this you can get for cheap in Christmas tree or Dollar store.
It depends on what you want to give. I feel as long as you have good intention,it should be fine.
As for what snacks, make some pakodas. Also make some halwa..that can be used as prasad and given to eat same time. And then if you can pack in ziploc, you can give a bit of that in the party favor bag.So you see..here the options are endless...(By the way,Im not so religious..so if you are asking for customs, I am not sure)