No suggestions anybody????
Even though this discussion is out-of-date I can still provide you with some information.
It seems that the folder icons are hardcoded into the Toolbox-software. So you can't assign your own icons to the Toolbox folders or files, but you can use theirs. It's a bit devious, but when you rename a folder into a Toolbox familiar name, the folder icon will automatically change after you've saved your Toolbox. For example: Rename a folder into 'Rivets'. It will look like this after you saved:
It seems that the software recognizes the name and automatically changes the layout. You're able to add text after the core name (ex. Rivets & Studs), but do not put anything before the core name of the folder. It will change the icon of the folder to the default layout.
Toolbox familiar names are (if I looked correctly):
- Screws (same as Bolts)
- Power Transmission
- Retaining Rings
- Structural Members
- Jig Bushings
You can also copy-paste existing folders to maintain the layout and fill them with your own content.