Here is nice little collection of butterflies to add to your next art project.
They were originally intended as patterns for jewelry.
Source:
RIJKS Museum
Museumstraat 1, 1071 XX Amsterdam, Netherlands
©: listed as Public Domain with CC1.0 license
More information about CC1.0 can be found here:
https://creativecommons.org/publicdomain/zero/1.0/deed.en