If you're like Vitaliy you'll probably have some sort of collection of scanned grain, flares, leaks, wipes, transitions, layers' skulls, effects and so on. Though not in every an each project, these resources, can be handy in some situations.

 
Projection Films has a nice set of these in FHD and 4K flavours. Many ( the ones in the folders) are FHD proRes. The files are licensed by Tim Clague under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0

 
It takes quite some time to download ALL of them. I left a 4.77GB zip file at mega ( use any browser but safari) case you don't want to go through the hassle. If you find them usefull consider donating to Tim >> http://projectorfilms.blogspot.pt/p/free-hd-downloads.html http://projectorfilms.blogspot.pt/p/free-4k-light-leaks.html

PROJECTOR_FILMS' free light leak and lens flare - DL 4.77GB Mega

  Some other sources for free "GRAIN" - https://www.premiumbeat.com/blog/10-free-film-grains-for-video-editors/