Hexagonal Grid
The hexes on the various pages fit into the grid like so:
(I assumed all the hexes kept their orientation, and (my computer) found that there was exactly one solution where all the coloured edges match)
There are two grey symbols on the grid: an AK-47 and a dot annotated with Arabic writing. These fall above a picture of Messi, and a picture of Messi scoring. These tiles are the only ones whose outline is all the same colour. They are blue and red respectively, and these are the colours of Barcelona FC, which is his team. The hex depicting treasure is next to the picture of him scoring.
The hex of the rainbow coloured xylophone is connected by a grey dashed line to the outline of the hexagonal grid. The edge where it lands corresponds to the bottom red edge of the hex showing the gold Aureus of the Emperor Claudius. Perhaps a piece of music can be created by going around the grid?