Here's what I've done:
-A standard lemming frozen in the walking position in 20x20, which was the minimum size(I already resized these to be closest to the 15x15 current stars, which means that the actual minimum size would be 10x10, but I felt that that would've been to small).
-A Christmas lemming frozen in the same walking position. I made it in 18x18 and 20x20.
-The four Fun through Mayhem rankplate(edited to fit the size of five "stars").
-A superlemming rankplate, which has a walking lemming going across the blank rankplate.
-The four Fun through Mayhem rankplates with red lettering.
My suggestions would be:
If you decide to use the lemmings like the stars, use the standard lemmings and Christmas lemmings for the non-staff and staff members respectively.
If you decide to use the nameplates, use the standard ones for their respective ranks and the red ones for staff members(this would keep the ranks for them instead of all of them being five star). I didn't make a superlemming staff member rankplate though, so my idea is to just keep staff members up to the mayhem tag.
These are simply my suggestions, you can do whatever you would like with these.