All the elements that you can draw from can be found on the HITRECORD website, where the BGE2 Dev Team have uploaded some assets for the community to work with. However, the focus of this collaboration is to create new and original artwork for Beyond Good and Evil 2. Of course, you can create original work inspired by the first game, but you cannot remix and use assets directly from Beyond Good and Evil (for example, you cannot take the BGE theme and remix it).