More to explore:
I made these stamps using the Stampin' Up! Undefined stamp carving kit! By Erin Cook with Artsy Acorn Designs
Along Came Stamping: Undefined Stamp Carving Kit - Native Art - Stampin' Up!
Hand carved stamps ... Undefined kit from Stampin' Up!
Excellent tutorial on making a Honeycomb Stamp This technique would work well for any geometric style
Bacon and Eggs - carve your own stamps! Undefined kit from Stampin' Up!
Undefined carving kit by Stampin' Up! Stampin' Sisters