You could hang pictures of pictures from your trip on the location. Not sure how it would look on a neutral-colored wall, but the idea is great. You could probably spray paint the cork and get a cool effect.
DIY hanging diamond decor by contributor Kathleen :: These use straws covered in silver muffler tape. She used cotton string, but fishing line works, too. All the dimensions for the straws are given for all 3 sized diamonds!