Travelling back from Spain on a KLM flight, I treated myself to a business class upgrade that was heavily reduced in price.
Someone in the design department of KLM must have some philatelic interest. The salt and pepper that came with the meal was presented in a small envelope. On the envelope was an image of the 2,50 Gulden stamp from the "Regina" permanent series(1969 - 1981).

The stamp, probably, was chosen as its colour (greenish blue) comes closest to the royal blue colour of KLM's livery. The stamp exists on ordinary and phosphorescent papers.

