Wire ferrules (also called boot lace terminals) and crimp terminals are not something that has been talked about a lot on ACL. First we'll look at ferrules. They are great for wires that are going into terminal blocks on controllers, fuse boards, etc. You can get them in various sizes to suit the cables being used. Always choose the ferrule size so that the stripped wire is a fairly snug fit into the ferrule tube. Unlike quick crimp terminals, the colour of the sleeve has no bearing on the tube size. Here's an example of them used on a fuse PCB. No chance of stray wires shorting things out. You will need to buy a ferrule crimping tool, but they are only around $25 on eBay. For blinky use, I'd recommend the 4-sided type (shown below), not the 6-sided type.