so, I've been working on a Blender file for a while, and I forgot what I did to make the wires turn dark blue, like so:
Anyone knows what this means?
It appears that you have enabled show weights under mesh display.
You can disable this in the properties panel while in edit mode by pressing N to open the properties panel, and locating Mesh Display and then unchecking the option.
Other blue lines can also be caused by having the sharp box ticked. Uncheck this if necessary too.