I used two leftover 7-Eleven cups and a cardboard roll from a toilet paper to make a cheap speaker for my smartphone : r/lifehacks
my DIY toilet paper roll cellphone speaker by tessanilo on DeviantArt
DIY Phone Holder & Speaker made from toilet paper roll - YouTube
Amazon.com: Meteou Adhesive Toilet Paper Holder with Shelf, Acrylic Toilet Paper Roll Holder, Wall Mounted with 3M Self Adhesive No Drilling, Toilet Paper Holder with Storage Shelf for Bathroom (Clear) : Tools