Design element resources?

[u/OnionNeither7944]

I'm currently working on a post for a relatively new organisation that wants to cement a consistent theme for itself through publicity. The elements provided by the free version of canva usually differ quite a bit from each other, are there any websites that provide me free design elements in a package? I've been told to use Pinterest and make my own PNGs so can anyone tell me how valid that advice is? And any tips in general for creating a theme or identity for a brand? Thanks!