Any ideas for a COOL INEXPENSIVE housewarming gift for my Kids/grandkids new home?

debsblmn asked: My kids(daughter and son in law) and wonderful grandkids just moved into their 1st home (owners!!!). I want a unique gift idea! I have never been able to buy a home myself, am on the poverty level, however want to give them an awesome housewarming gift. I am a gardener so they know [...]