all sorts of possibilities
I actually bought these before I bought the stamper for them. They are so easy to interchange on the round stamper, it's actually harder to get ink on your fingers than it is to change the seal. Once they're on the stamper, you need to stamp on a practice sheet for a bit to get perfect ink coverage, but after that you're good to go, just make sure that when you stamp down you use even pressure so the image stays crisp. Pressing down with a moderate speed and even movement seems to work best for me.