Design for a bookmark' pack based in Lord of the Rings’ theme wel to me most exactrly is based in The Silmarillion. Those character are Valar (Gods), now I'm going to copy-paste their info from Wikipedia:
Yavanna Queen of the Earth and Giver of Fruits, spouse of Aulë, also called Kementári. She created the Two Trees, and is responsible for the Kelvar (animals) and Olvar (plants). It was she who requested the creation of the Ents, as she feared for the safety of the trees once her husband had created the Dwarves. The Two Lamps are created by Aulë at Yavanna's request, and their light germinates the seeds that she had planted. Following the destruction of the Two Lamps by Melkor and the withdrawal of the Valar to Aman, Yavanna sang into being the Two Trees of Valinor.
Manwë He is the King of the Valar, husband of Varda Elentári and King of Arda. He lived atop Mount Taniquetil, the highest mountain of the world, in the halls of Ilmarin. The winds and airs were his servants, and he was lord of air, wind, and clouds in Arda. He was the noblest and greatest in authority, but not in power, of the Ainur and the greatest of the Aratar.
Varda Queen of the Stars, spouse of Manwë, titled Elentári in Quenya and Elbereth Gilthoniel in Sindarin. She kindled the first stars before the Ainur descended into the world, and later brightened them with the gold and silver dew from the Two Trees. Melkor feared and hated her the most, because she rejected him before Time. The Elvish hymn A Elbereth Gilthoniel appears in three differing forms in The Lord of the Rings.
Oromë Brother of Nessa and husband of Vána, also known as Araw in Sindarin, Aldaron ("Lord of the Trees"), Arum, Béma, Arāmē, The Huntsman of the Valar, and The Great Rider. During the Years of the Trees, after most of the Valar had withdrawn completely from Middle-earth and hidden themselves in Aman, Oromë still hunted in the forests of Middle-earth on occasion. Thus, he was responsible for first finding the Elves at Cuiviénen.
Ulmo Lord of Waters. Unlike the other Valar, he was not married and had no fixed dwelling place. He lived in the deep waters of the ocean, and seldom troubled to come to Middle-earth unless the need was dire. Ulmo was one of the chief architects of Arda. In power he was second to Manwë.
Melkor The First Dark Lord. His name means "he who arises in might". He was the first of the Ainur to be created by Eru Ilúvatar and the one who created discord in the Music of the Ainur. The spiritual brother of Manwë, he was the most powerful of the Valar, as he possessed all aspects of Eru's thought, whereas the others each possessed only some. He turned to evil, and was taken back to Valinor in the chain Angainor after the Awakening of the Elves in Cuiviénen. He remained on parole in Valinor for three ages, but after the poisoning of the Two Trees and the theft of the Silmarils, he fled from Valinor. He was no longer counted among the Valar, and Fëanor, one of the leaders of the Noldorin Elves, called him "Morgoth Bauglir", The Great Enemy, by which name he was known in Middle-earth ever after. He was cast out of Arda at the end of the War of Wrath.