I got my first busy bag idea from Motherhood on a Dime. This looked really simple and something that would keep my daughter occupied for sometime.
I had to coach her through the first two times, but after that she loved it! Then she learned that you can eat the noodles! So, needless to say, this does work if your child doesn't eat the noodles or you just don't care (like me) if they do.
I used colored paper and double sided tape to make the labels and just stuck them to some plastic cups that I had. When she is all done I store everything in a zip lock bag, labeled "Pasta Noodle Sort".
I hope you try this out, let me know if you do and if it worked for your child.