It's amazing how a cheap toy can enhance their play so much. I got them some Bendaroos for Christmas (for those of you who don't know, they are just wax covered colored strings that stick to themselves or other things, but come off cleanly.) They have played with them steadily ever since.
They have become costumes for figurines:
They are bed (and wall) decals in the their room:
And we now have about twenty Pokeballs (a much cheaper way to obtain them, I must say:)
Yep, sometimes it's the little things that make all the difference.