I've always regretted that, since it means that when I just want to take out a box & play for a bit, I don't have any designs my 4A or 6A. so they don't tend to get mush use.
Today, I decided I'd just see what I built without a design, using the 4A box. This is what turned up, using only part of the stones.
Kinda cute, but I'd have to say I didn't enjoy it as much as building from a design.
That may just be me.
And nonetheless, it was good block play.