Bicycle grips! One of the simplest additions to any bike. They are easy to get on and off so you can DIY. These hot leather grips are 24 bucks off etsy, but you can find grips much, much cheaper and you can find them in almost any colour. These are avaliable in natural, honey, brown and black.
But why pay so much you might ask? Leather is one of the nicer materials to touch and when riding, wouldn’t you prefer to touch something nice? Would you prefer a leather bag or wallet over one made out of cheap rubber? Probably not. Leather also wears beautifully, the same way a nice pair of leather shoes does, and its weatherproof.