DIY Picture Frame

Ok so basically I suck at being creative and doing crafts. But I ordered some pictures of my sister and daughter together and I want to decorate the picture frame I bought and add “I love my auntie” or “Auntie A & Me” something cute, but I don’t know what I should use for letters how to decorate etc. I thought about using those stick on foam letters but I don’t want them to fall off. HELP LOL