Alright so Sculptures is a fairly “new” resource that was added to Warframe in combination with the replacement of the old fusion system and introduction of Endo to upgrade mods with.
Where to find Ayatan Sculptures?
Sculptures can be found randomly usually in start of missions in plain sight, but are also available as reward from certain missions. And apparently can also be guaranteed from a weekly mission you can go and get from Maroo at Maroo’s Bazaar.
Purpose of Ayatan Sculptures?
Every sculpture is worth a certain amount of Endo and can be traded in at Maroo’s Bazaar – OR if not in need of endo, do what I do, decorate your ship with them xD They make for badass decoration in my opinion – makes one feel like a king in his own ship :P
There are two different type of Ayatan Stars, one yellow (rare and more valuable endo-wise) and one blue (more common, less valuable). These Stars can be found from caches in missions randomly – so make sure to destroy those caches :P
The purpose of Ayatan Stars is to be equipped to sculptures in the ships Mod-segment where they will then increase the total worth of a Sculpture.
NOTE: Apparently it seems that both Ayatan Sculptures as well as Ayatan Stars can be traded with other players, which might be useful to keep in mind if you ever in need of a few thousand endo quickly. And they are fairly cheap on Warframe.market as well so have at it :P