A model of the logo of the Metal Band Amon Amarth. I uploaded three objects with different thickness of the frame around it (first measurement) and the logo itself (second measurement):
1: 1.5mm + 0.5mm
2: 2 mm + 1mm
3: 2.5mm + 1.5mm
I recommend the second version as it is robust enough not only for decoreation but also for a pretty decent key chain.
If you have any suggestions in enhancing the object or want to have something bigger or smaller, just text me and I will make a better (other) version for you.
Have fun :)