Normally I do not purchase pre=tied "neckties" or bowties, but even they can be used.  Most of the pre-tied are polyester and plain, but there are still tips to use, and if the fabric is interesting, it can be used in small pieces.  Bow-ties can be disassembled and the small pieces used.  I made a small wall piece using pieces from bowties to make Bowtie blocks - one from each, with a recycled dress shirt as background.