I've seen rainbow roses grown or made that way with a moist paper towel dyed in a special pattern. The roots or stem absorb the dye with the water. Maybe the cactus is similar?
I had this really cute treat in Japan. Heart shaped cakes on a stick with strawberries! The strawberries were really sweet and kind of looked like hearts as well
Windlyn is so fun, Windlyn is so grand, So come on everyone, All across the land, Come and join us now, In this awesome site, We will show you how, Talking through the night. ~npixelz