I have done a lot of painting using the small foam brushes. These are disposable brushes and rather than throw out the whole brush, I push off the foam head and save the wooden dowel. One of the uses I have found for these dowels, is they are great for hanging tools, tape, and a variety of other items. I have a log home at the lake. There is an attached shop on one side of the cabin. One of the inside walls is the log. I measured the dowel and found that if you drill a 29/64" hole the dowel fits very snug into the hole, in fact you have to hammer the dowel in. I drill at a bit of a downward angle so the dowel is at an angle pointing up.
If you can not drill directly into your wall, you can also use a 1 X 4" or 2 X 4" board and drill into them. Hammer your dowels into the board and then mount the board on the wall. I have things hanging on these dowel from extension cords, to welding helmets, to tape and even my workmate.
I think this is a great re-use of an item and is also sturdy and versatile. Save those brush dowels and let your imagination run wild. I have attached some pictures to give you an idea of their uses.