you have to think sideways a little, there is texture and pattern all around you, it confronts you every day when you look in the mirror, when you look at others and everything you encounter, so what you need to do is to teach yourself to look for it.
A simple one is take a pic of granddad or another old person, take it with the light hitting their face at about 45deg, ie slightly to one side.
When you process it, convert it to black and white, add film grain and then boost the contrast a little while dropping the levels so its slightly under exposed.
The result should highlight the texture of their skin, with it resembling old worn leather.
Now do the same with an old tree, bricks etc.
B&W really helps focus the eye on texture and pattern as there is no colour to distract you.