Craft ideas for many buttons (from clothes)?

You might try wall art made with buttons. Add to a canvas or poster board. One idea attached but opportunities are endless. Enjoy!

http://craftsbyamanda.com/wp-content/uploads/2015/04/4-season-button-tree-680.jpg

Here is what several Hometalkers have done, maybe one of these will inspire you - https://www.hometalk.com/search/posts?filter=buttons

https://www.hometalk.com/search/posts?filter=buttons

Pillows. See below

How about a button project picture?

https://www.hometalk.com/diy/decorate/rooms/another-button-project-huge-scale--16202639?r=1

I have seen people do monograms on frames. I've seen pictures that look like paintings with buttons. I've also seen jewelry made with buttons.

https://www.youtube.com/watch?v=ePoSrrUsZlE

Sewing them on plain sofa pillows, on quilts, make a bracelet with them, broaches, lots of ideas!

How about a busy quilt for people who have dementia? Keeps their hands busy buttoning and unbuttoning. You can also add other things for them to do.