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You may want to look at http://fileformats.archiveteam.org/wiki/Category:Graphics. Collecting sample files from there is a bit of a hassle, but there's quite some obscure formats.

On the same site, http://fileformats.archiveteam.org/wiki/Encyclopedia_of_Grap... points to an archive.org copy of a CD ROM with sample images.

Via its BMP page, I found http://entropymine.com/jason/bmpsuite/, which looks like the definite resource on that format.

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