The great thing about these beans is that they are big enough to clean up easily, sturdy enough to not make a big mess, and also big enough that the kids aren't tempted to stick them into any bodily holes (although my kids aren't prone to that kind of exploration anyway).
So, this is my sanity-tip for all of you (like us) who are watching LDS General Conference this weekend. You still have time before the next session starts. Go buy a $3.29 bag of lima beans. If your kids are anything like mine, they will be completely engrossed for at least the next two hours. This morning our beans have been pushed around in construction equipment, collected into cargo cars on the duplo train, poured into containers in the play kitchen, fed to pretend-pet hedgehogs and the list goes on and on.
(This was taken the day the beans arrived, back in December.)