Starlight stands 10 inches tall (25cm) when made.   He can be sewn as either unicorn or an ethereal horse  : )
He has thread jointed legs and can be made for a Fat Quarter of fabric - perfect to use up that beautiful fabric in your stash.     His pattern includes instructions for a child-friendly version too and has plenty of photos and diagrams to help you create your own unicorn.
I've made Starlight in a 100% cotton fabric, but he would look great in velvets or fake suede.   Full sized pattern sheet is included with a few alternatives you can try too.