How big are 'fabric crumbs'?
 

I am starting to save these to give away but I'm not sure how small is too small.

Remember to subtract 1/2" for seam allowance. I probably wouldn't use anything smaller than 1.5" To me, it is just another type of crazy quilting. Good Luck ! No rules either !!

Anything smaller than 3/4" is no good. It all depends on how small you want to work with. My limit is the smallest.

You can barely use that for a bonnet tie.

smallest ill ever use is 1/2in HST...

How are they going to be used? A lot of folks use the tiny scraps to stuff pet beds. In this case, there's probably no 'too small'. If they are going to be used in blocks, like a crumb quilt, then 3/4" would leave you with 1/4" useable.

I have no clue how they'll be used. I was about to throw away a bunch of small scraps after using a sizzix die and thought maybe people wanted them. That's why I want to know what to save. I don't want anyone paying postage for something that they can't end up using.

Maybe it would just be easier to toss it all. ;)

and some use anything cut off in pet beds for rescue

Never thought about pet beds for rescue nice idea.

I save ALL scraps!! I get old pillowcases stuff one- takes quite some time! When full as i want, i stitch close. use other case for cover. i hate to waste!!!!!