You'll find Sugru at the intersection of childlike fun and grown up practicality. The colorful substance starts out as a 3D glue you can mold into virtually any shape and stick wherever you want it. The product bonds to ceramic, glass, metal, wood and a range of other common household surfaces. Once cured, Sugru becomes a flexible silicone rubber, which stays fixed in place even while remaining soft to the touch. Basically, it’s Play-Doh for DIYers—and a great gift idea to boot. Available at The Home Depot; $11.98 for multicolor 3-pack.