They’re impressionistic backgrounds of the garden. The important thing to remember is that the ride was not lit up like it was for that photo. It was just black light, so the colors looked very different and riders only noticed the parts of the background structure that the artists wanted them to see. Of all the pre-1983 dark rides, Alice was the boldest with experimenting with black light effects, crazy color combos and color against sheer black.I found a page talking about the 1958 version, but this one is interesting because it has a proper layout of the ride. https://web.archive.org/web/20001217220700/http://www2.aros.net/~pov/issue03/rabbithole.html
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One weird thing I noticed is that at the beginning of the Garden scene, there are these rectangles with flower patterns on the walls. What are these supposed to be?
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Love that excellent track layout drawing!!!