"These eggs are great for a project I saw on the internet(they used peeled hard boiled eggs) and wanted to try. I don't have to worry about the smell or mess of real eggs and can prep them way sooner than if using real ones. I would say yes buy them if for other uses. No if you want them for the kaleidoscope part. I looked through mine and just saw a blur no pretty designs. I don't see any kid having more than 30 seconds of interest in these."