This outfit has them in spades! And I believe it works. In fact, this outfit is nothing but pattern: dots, stripes and floral.
Mixing dots (or any pattern for that matter) is all about scale. Mixing scale in particular. For beginners I suggest mixing one large print and one small print. I would also suggest keeping the palette minimal. Like this outfit. All black and white.
I've also kept accessories minimal. This helps to keep you looking like you're crazy, or that you got dressed in the dark.
Advanced mixers can mix colour and pattern. For this I suggest looking at runway pics and Lookbook pics for inspiration. Do it like the pros! Like this:
Bow Headband (actually a satin belt I got with a pair of pants) : Smart Set
Vintage Crystal Necklace: Ragpickers
Polka Dot Tee: Thrifted
Black Satin Belt: Le Chateau
Multi Print Black and White Skirt: Ricki's
Polka Dot Peep Toe Pumps: Le Chateau