I've been wanting to make striped pasta for a while. It's suprisingly difficult to learn about how to make striped pasta. In my online research, I was able to find a few different techniques. I went with making a base layer of egg pasta, then using water to glue colored fettucine or cappellini to the base. Then I rerolled it. It certainly was imperfect - the stripes often folded or bent. As I was making a bowtie shape, I wasn't too concerned, but to make perfect striped fettucine would be challenging.
I made egg pasta with 4 eggs to 3 cups of all purpose flour, then adjusted if necessary with an extra yolk. If I'm doing filled pasta, I use the same ratio but add a little olive oil instead of extra yolk. I added tomato paste for the reddish orange pasta and spinach to make the green. The striping took much longer than making solid colored pasta, so I made some straight tomato and some straight spinach then mixed them all together.
Eventually got tired of making bowties and made these:
