Design the Run, Not the Single Panel
The most important shift in thinking is that people see your barriers as a line, not as one panel. As someone walks the length of your frontage, the panels pass by in sequence.
That gives you two broad approaches.
Repetition is the safest and usually the strongest. The same panel design repeated along the run reads as a clean, deliberate, branded boundary, and it means you can add or remove sections later without breaking the look. For most businesses this is the right choice.
A sequence, where panels carry different content that reads in order, can work for a longer run: a logo, then a strapline, then an offer, then contact details. It is more ambitious, it depends on people passing in the right direction, and it breaks if you reorder or extend the barriers. Use it only with a reason.
What tends to look messy is a random mix of unrelated panels. If they differ, they should differ on purpose.