I was unable to find any decorations for a 50th birthday party, so I created a few, and thought I would share.
Printrbot Simple Metal
I printed these in PLA. You will need to print the springy outside and honeycomb pieces of the numbers separately, and then assemble. For the 3 outside pieces (outside on 5, outside and inside on 0), I set the slicer (I used Cura) to 0.4 shell and 0% infill so that it prints in a single pass. You can scale to fit your needs and print bed size.
The numbers have a groove on the inside to insert the honey comb center.