They are not round, nor are they spherical. The shape is an oblate curved semi-regular 20-hedron formed from 12 pentagons and 20 hexagons, with 60 nodes, otherwise known as a buckyball or a Buckminsterfullerene molecule of Carbon-60. (Try googling buckminster-fuller if you want to know what I mean).
The shape was first made in the first instant of time after the Big Bang, and the Universe is still expanding in the same shape as we take Answerbank forward.