Multiphasic liquid "flotation" experiment
https://www.youtube.com/watch?v=GRPufqPgTeI

I played around a bit with this in the lab and this is what I came up with.
Basically, I made a three phase system with hexanes on top, water with fluorescein and green food colouring in the middle, and a perfluoroalkylether HT-110 on the bottom.
Just finding three mutually immiscible liquids was pretty challenging and unfortunately, like most highly fluorinated liquids, HT-110 is almost twice as dense as the other two liquids, but if you look at the video carefully, you can see that some bubbles of HT-110 are getting trapped in the hexanes as its surface energy isn't quite as high in hexanes as it is in water.
When I tilt the vial on its side, you can see these bubbles snapping back across in the interface.

It's not perfect, uses a goofy solvent, and I probably could have played with the liquid ratios/container shape to trap more HT-110 at the top, but it seems that something at least similar to what you're after can be made fairly simply.