Keep it simple
Start by picking a color. Try to think about the other colors in the room you’re remodeling and think of something that would complement them. Next, think of the pattern you would like to have on one or more of the walls (an accent wall with a pattern would be a nice way to see if the pattern works for the room). Assorted lines a-la hunting cabin is a great place to start. They don’t have to be perfect or the same size, plus, you don’t need a stencil for it.
How to create a stencil
If you’re a little more ambitious, you can try creating a stencil and work with it in even spaces. You start with an A4 sheet of paper and draw the shape you’d like to pattern on the wall (heart, star, moon, whatever it is you’re into). If you’re not exactly skilled with a pencil you can just print it with your home printer. Once you have the shape, cut it out so you have a stencil to work with.
Now get to work
Start in the top corner of the wall, hold your stencil up against the wall and paint the inside. Repeat to make a pattern as you wish. Work in small sections and stop for reevaluation every once in a while. You might find out that a few rows on the top pop well enough or that you want a few clusters of the shape in each corner. You are the boss of this project.
How long does it take?
The paint job shouldn’t take more than one afternoon. Put on your favorite playlist or line up a few episodes of your favorite podcast to keep you company and you won’t even feel the time fly. By bedtime, you should be able to put all the furniture back in place.