This DIY is more of an idea than an actual tutorial, just because it's that simple. All you need is some scrapbook paper, tape, an embroidery hoop or other round item for tracing, pen, and ruler.
Start off by measuring your wall or surface and figuring out how many polka dots you want to include. You can either do a whole wall of dots or just use them to frame a photo or something. Trace the same size circles on your scrapbook paper and cut them out. Then space the dots evenly along the wall and tape them in place. You can include just one color or rotate a couple of different ones. I'm thinking about adding more to this wall. What do you think?