The thing about using rubber stamps is that unless you are not using a really harsh black ink or dark red for instance, it creates a really subtle but decorative effect. With certain pens, once the ink is dry, you can even write over it! Plus, rubber stamps never run out, unlike stickers or washi tape!
Here's my decorative Filofax pages for Monday & Tuesday, let me know what you think! :))
Both ink and stamps are from Hobbycraft.