Not twine - but maybe yellow and grey yarn or some kind of ribbon material?
Twine Wrapped Rustic Wooden Letters with Crochet Lace Pearl Flower (25.00 per Letter). $25.00, via Etsy.
A fun craft. Use burlap strips or brown packaging twine for more texture.
30 Blooming DIY Monogram Letter Ideas
twine wrapped letter
Cork Letters / Twine Wrapped Letters / by PartiWithPersonaliti
Burlap Wrapped Letter 'L with Lace Flowers & by MadeWithLoveByLori, $25.00
how to really wrap a letter
DIY Whimical Wrapped Letters - Weddingstar Blog
Rustic Wrapped Letter H Rustic Letter Country by DreamersGifts, $35.00