If you're going to offer blueberries, be prepared for a slightly purple-tinged hedgehog. I gave my hedgehog, Hemi, a taste of a blueberry once and I could never get the blue stain out from beneath her nose.
For fruits like that, remove the skin or squeeze the innards out. I heard that the skin can get caught in the roof of their mouth, and may cause a hedgehog to claw at their face and injure themselves when trying to dislodge it.