Problem: You want to use a traditional AutoCAD "Classic" interface with the traditional "Light" color scheme, but many of the toolbar icons are either entirely invisible, or barely visible.
sample
Solution: Open a previous version of AutoCAD and copy all the toolbars into a custom Cui, then partial load that Cui into AutoCAD2015. Disable all the toolbars in the main cui (acad.cui) and load up the toolbars stored in the partial CUI created in a previous version
Result
Obviously, this is unnecessary when using the "Dark" scheme.