I was at Homegoods earlier today with SWMBO and found this bowl. Not bad for $3.99. There were several other options for about the same price. Not too shabby and fit week in the hand, and I do not have Andre the Giant hands.
Basically, or spirals, or spiderweb'd. Basically, if the interior surface is too smooth, it takes longer to build the lather. A textured surface aids aeration of the lather as you build it.
or you could scuff the interior with 80-120 grit sandpaper also.
Yep - that simple. Try some shaves with the bowl as and see how you like it first. If you feel you're not getting a sufficient lather, try adding beads of epoxy for some roughage and see if that helps.