Does the wall in your nursery look a little sad? Maybe it could do with a bit of embellishment? For some fun letter art, all you need is a bit of cardboard, yarn, a glue gun, scissors and twine.

Walk into any home décor store these days and you’ll see that alphabet art is a big trend. There are big capital letters made of metal, wood, wire, plastic — and some even light up. But you can make ...