I would put Market cotton scarf from Equatorial Guinea on the list for Equatorial Guinea because it is the kind of thing that feels useful once you are home, not just another airport purchase. I would avoid the obvious tourist print and look for something with a local pattern, fabric or cut that still works with normal clothes back in the UK. The reason it works is that it gives you a quick reminder of the trip without needing to keep a fragile ornament safe forever.