I've been thinking about the different ways to depict the Doctor in the fics here, and I've been wondering about what people here prefer to use.

Here's what I've seen in this group's fics:

1. Rule 63 Time Turner
2. Background mare with the hourglass cutie mark (especially Colgate)
3. Other background mares.
4. Non-background mares.
5. Original design.
6. Other.

What are people's thoughts on these?