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I use pixiv and 4chan to find new fap material, save the ones that stimulate me, bookmark (on pixiv) the best of my findings. I throw all of 'em into one unorganized sallad of images, only putting doujins in their own folders and having one folder for anime/manga wallpapers (which are all SFW) and one for cuteness, which I use when I draw (which I rarely do) to guide me.
The few times I've made use of my collection has been when my internet has been cut out, or when I've needed to jerk one out quickly but didn't have the time to browse the net to find material to "assist" me.