Indie brand Pretty and Polish has a number of thermal colour-changing polishes; this one is Sundown, released earlier this year. All these photos are taken with flash. The second one is also near a window so it appears lighter.
In its cool/room temperature state, Sundown is a light apricot orange colour, with matte hex glitters in orangey yellow, pink and pale yellow.
In its warm state, the base turns to a soft golden pastel yellow, and the golden shimmer in the base becomes more apparent.
Yep, my fingers are extra red in that warm photo, due to dipping them in hot water!
Here is Sundown in a transition state, I love it! When I was in a warm location (i.e. not my cold apartment haha) I would sometimes find that it would stay in a state of yellow nail bed and orange tips. 
These photos show three coats of the polish, plus top coat. You could probably get away with two coats but I didn’t want to take chances that it would end up appearing streaky when warm, since the warm colour is notably paler than the cool colour! I found the polish easy to apply; I did a little bit of “placement” of the glitter, but not too much. The formula is fairly thick, as most thermals are due to the nature of the colour changing pigment. All in all, a great polish!!
