Houseleek

From Wikipedia:
Houseleeks or Liveforever (Sempervivum) are a genus of about 40 species of succulent plants of the Crassulaceae family which grow in rosettes. Another name used for some species (and also for some plants in other related genera) is Hen and chicks.

We got this little plants from good friends of us at their wedding.
It's an ideal plant, because if you forget to water it, it will get brown and looks like Tumble-weed, you see in Western-movies. But when you apply water to it, it will open again and even show colours withing a few hours.