This morning I took a nut can & cut an extra large roundish hole in the cover. Then I gave Miss L the milk cap covers. She had a blast with them. She stacked them, held them in her hand, and yes, even put them in & out of the can.
I had to pull out the poker chips I have because Miss H was going through this so fast I couldn't keep up with her! This kept her occupied for at least 30 minutes - which in one-year-old time is the equivalent of two hours. In fact, she had such a great time with it we showed it off to her mom when she came to pick her up & I sent the milk caps home with her so she can make one of her own.
I also tried large popsicle sticks with Miss L with the other nut can that has the smaller slot in the top. She did pretty well this & we'll probably try it again. I pulled this out near the end of the morning so she only did this for about 15 minutes, but it seemed to work well.