The organisation less Plastic (https://www.lessplastic.org.uk/) was set up in 2015 to raise awareness of ocean plastic and provide practical ways for individuals & organisations to make a difference by using less plastic and taking actions that restore nature. They have produced lots of useful infographics suggesting ideas for using less plastic including one on gift buying which suggests:
9 ideas for gifts with less plastic
1. Homebaked, homemade or homebrewed goodies
2. Pre-loved, vintage and charity shop finds
3. Quality reusables to encourage eco-habits
4. Houseplants or natural candles in glass jars
5. Local, artisan products in glass containers
6. Unpackaged soaps or oils in glass bottles
7. Reusable fabric gift wrap or recycled paper and string
8. Membership of an ocean conservation charity
9. Experience gifts, making memories together.