Mine was 1" - 3" river rock.
I like 1" washed rock... I bedded a lot of beds in pea gravel, all the way to 3/4 washed... The stuff will not stay in the bed (even as you complain)... 2" starts to be hard to walk on... And I don't like the finished texture as well either (according to sight).
If you want it to stay put, use shale. It is irregular and sharp in shape, and binds like the dickens.