By your fourth wedding anniversary you are definitely a couple.
A book is a very personal gift, flowers are a very romantic gift and fruit well fruit is a nice thought.
So you could make a fourth anniversary gift basket that covers all the bases.
Get a great basket, put a book you know she or he will enjoy in the basket, add a huge bouquet of her or his favorite flowers and fill the basket with apples, oranges, grapes and whatever other fruit is beautiful and in season.
Even if you aren't artistic or crafty, you can still create something for him.
You don't need to make something perfect; a few flaws will add to the charm.3.