I dunno if stimming counts as a ritual, but I tend to tap my hands in certain patterns or wiggle my toes, or whirl my head around. Sometimes i pinch myself, and i generally tryto do is symmetrically so that the same pressure is put on either side of my body. I think most of my OCD-ish rituals and habits are really stimming, just in very precise, regular patterns.
I pace back and forth a lot, or in circles. Sometimes I have to get the same number of steps on each square of the side walk and make sure the crack hits right on the middle of my foot.
When I eat, I generally split my food in half so I get roughly the same amount on either side of my mouth for chewing. With skittles, the same amoumt of each color on eithet side of my mouth, even if that means splitting one in half.
I'll bounce up and down a lot. I think my cigarette smoking is as much an autistic habit as it is a physical addiction (but it's also that). Same with my morning coffee.
I get songs stuck in my head a lot, besides having to listen to certain ones a lot on repeat. I also have a tendency to repeat certain words or phrases in my head or maybe mouth them.