Is the window lighting the only lighting available to the tank? If so, keep in mind that window glass filters out UVB radiation, which will cause problems for the anole in the long run, and must either be supplemented with a UVB fluorescent, or a D3 supplement. Also, they should have a basking area as well, and with a tank that small, you'll have to be careful, since an incandescent basking light can burn orchids.
That being said, as for small orchids, you can look into Schoenorchis fragrans, Mediocalcar decorata, Epidendrum longirepens (or similar Epi species), some of the small creeping Dendrobiums like lichenastrum and prentecei, and small Pleuothallids like P. grobyi. I would try to avoid anything with longer leaf structures, as the anole may damage them as it hops around the tank.
For what it's worth, I'd suggest something larger for the anole, like a 29...light it with some coiled CF's (1 being a UVB reptile bulb), and a low-wattage incandescent bulb. Give the anole some climbing branches that reach up to the basking lamp. Then you can mount orchids, and have enough space to get them away from the incandescent if you have to. Windows can also cause glass tanks to overheat rather easily, especially during the summer.
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