ETB would be too large for the 'small species' requirement IMO A GTP might work. Both species generally just stay perched, so they look nice but they don't tend to move a lot during the day in my experience.
Amazon Tree Boas are awesome, I keep several, but as far as a display - they are really only active at night and spend most of the day curled up on a perch (hidden if possible) or in a hide (photos of mine here: https://ball-pythons.net/forums/show...2-Wall-of-ATBs )
A crestie would probably be a good choice, they are small, easy to care for and well, adorable. They will also hang out on the walls or on sticks/leaves and such instead of other active cute species such as leopard geckos that stay on the ground).
Good luck with whatever you choose!
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