In the Probuilder set, maybe design any type of spaceship of >2000 pieces, and where inside put the space rover expedition.
In another lines, in Destiny, maybe design all big bosses (Oryx, Crota, Skolas, Sepkis, Undying Mind, Sekrion, Qodron, Phogoth, Omnigul, Valus, S.A.B.E.R.-2) of the franchise.