I think your gift ideas sound awesome! I've thought about wanting to have "matching" necklaces with my T too since she gave me one of hers. If you do give it to her, I just personally would want to make it clear that I didn't expect her to wear it all the time. I have given my T a gift before, for Hanukkah though not a birthday, and she reacted really happy. I gave a little decorative dish thing and a card, and she was just super sweet about it. I plan to give her a birthday present this spring too. Anyways, it's awesome your T gave you a coloring book, and I think you have good ideas for a gift!