I don't have many patterned cloths, if you don't count stripes. Always on the lookout for them to hoard for possible still lifes as I love patterns in paintings ... Matisse, Vuillard, Janet Fish ...
I rarely tackle patterns--i think they will be too "hard."
In the still life class I took with her last year Susan Abbott gave us an exercise that I think will help me get over my reluctance: Paint a pattern without drawing it. Just work your way through it, remembering there's no reason for it to be perfect!
Actually, it occurs to me I didn't quite do what she suggested, I didn't find the shapes by painting the negative spaces-- which are white here--but painting the shapes without drawing you do have to consider the negative spaces as you go.
I messed up here and there, but what an engaging way to spend a half hour or so.
Below is the bit of fabric painted in Susan's class.