Rijksmuseum in Amsterdam is making it really easy to engage with them online. They have been using Pinterest in a really interesting way while the museum is closed for renovations.
They also have Rijks Studio where you can order customised prints in various formats or download the high quality images from their collection and create your own artwork.
They really want people to do things with their art works and they are making it really easy - even giving ideas and suggestions. They are also asking for people to share what they are using the art works for.
They provide step by step instructions - and lots of images.
I have not come across a cultural institution making reuse of images for other purposes so simply. This is really impressive.