LB, keep in mind mishloach manos needs to be 2 food items, so your healthy theme and hygiene theme would not qualify for the mitzva. (I am not sure, but I think that water may not count.) The rest is cute, but the food needs to be there. The coins give to matanos l’evyonim.
I always do simple or cute themes, along the lines of what Lilmod was saying- this way I can give 2-3 small items and it can still look nice. My goals for mishloach manos are 1) light and portable – since we will have to schlep around the neighborhood holding many of them at once 2) can be prepared and packaged in advance- which means it is harder to give “real” food that needs to be stored in the fridge 3) not too time-consuming to prepare and 4) makes people happy. Usually, they come out to just a few dollars per package.