Fix Missing Icons in Yosemite Finder

Today I've found that I was missing some icons in Finder:

Not nice. However, after scouring the internet I found the simple solution:

1. Reboot in Safe Mode (use this link)
2. Log in as yourself
3. Reboot normally
4. Log in as yourself

...and voila! You have the icons back!

References

All credit goes to:

• Apple - safe mode
• MacRumours - other people that had the problem