Buying a pack of those eva foam "safety mats" & putting them around the house might help. In general if you get them toys & things they like destroying more they usually go for those first. Also wadded up paper or note cards make for great toys. They need fresh ones from time to time because they seem to like them crispy. And just some plain string or ribbon can be good too. When they get wound up throw a wad of paper or break out a laser pointer.