After seeing sequencing cards on a few other blogs I thought I'd give them a try. My son (who is 32 months) struggled a little at first with them. I would have to put them in order, talking through what I was doing, and then he could repeat the process. We'll keep practicing with these.
Here are the 4 sequence groups I did:
Building a house:
A person growing up: (This one was the easiest for him)