I used to do this when making little gifts for people (yeah I am and was poor). You put together a homemade cake mix or soup mix with dehydrated foods/buillion/etc. Print up some nice instructions, perhaps put cloth between the jar ring and lid for decoration and voila! Something kinda interesting.

I used the really small O2 suckers since most of the time I was packing quarts and pints for this purpose. works like a charm!