I think making paper and bread is too simple and cake too. What about editing bread recipe to turn in into a cake recipe with one thing different - insted of 3 milk buckets there would be 2 milk buckets and one water bucket. For paper recipe I'd add 1 water bucket, 1 paper and 1 sponge - though I idk how would you make sponge after crafting paper soaked and still in crafting table.. And finally for cake insted of 3 milk buckets I'd decrease it to 2 and add one apple.
All and all would make realistic and challenging recipes.
And make villagers not wanting to get into water. They always swim off and sometimes die because of it. I hate it when it happens.