I've been collecting designs since 2000 and I'm sure others have been collecting longer than that. I make a folder for the website I acquire the design from, if its a set of designs, they too will get a folder within the website folder, then I have a folder for just freebies from that site. True that's a lot of folders but I know where I can find my designs easily this way. May not work for you or others but it works for me. When I'm working on a project I have made a folder that will show up right at the start of all my folders and I'll copy the designs into this folder and of course in a folder designated for that project as I tend to have a number of projects going at one time.........as for my quilt labels. I made up a basic quilt label that I can pull up and add the wording needed at the time, save it for when I actually go to use it.
I also have generic folders..............alphabets, floral, redwork, etc. from long time ago and I have no idea where those designs came from. For any design(s) I purchase I add a "$" alongside it so I know I paid good money for it.
I also keep all my designs on a separate hard drive from the main hard drive in case the system crashes it won't take my designs with it. Then once a month I back up all these files onto an external hard drive in case my PC goes to the shop then I can use it on my lap top till it gets back. I have all my basic personal files...........statements, tax files, etc. on this hard drive too.