I like my set of Lego Dublo, which is basically ordinary Lego bricks enlarged ×2 in each dimension.
I bought them second-hand from a private home – a lot of bricks and accessories at a pretty good price. When I had paid for them and was about to leave, she said something along the line of "Have lots of fun with them" (paraphrased and translated). She said it with a funny grin, and I have no idea whether she just said it for fun, or if she had a hunch that I was going to use them myself.
My point is, if your AB persona is old enough to play with simple Lego bricks, Lego Dublo might work out for you.