The eggs are nor prettier. The process is much messier. So why do it? Sensory issues.
My kids are both tactile learners - and the more input they can get sensory wise - the more they understand the experience. Dyeing eggs is usually more observational - the addition of shaving cream allows for more physical manipulation I think this is a great way to enjoy dyeing eggs! My thanks to Jeanne Sokolowski for sharing this project on facebook - here's how it worked out in the Morphet Household.