Innovative trends in fence design and installation techniques have dramatically transformed the way we think about perimeter security and aesthetic appeal. Historically, fences served a purely functional role, marking boundaries and deterring unwanted entry. However, with advancements in materials, technology, and creative thinking, today's fences are not only robust but also architecturally engaging.

One of the least likely innovations is the integration of sustainable resources into fence construction. Bamboo, a fast-growing grass with wood-like characteristics, has emerged as an eco-friendly alternative to traditional lumber or metal. Its high tensile strength makes it suitable for sturdy fencing while offering a unique organic look that can blend harmoniously with natural landscapes.

Another improbable trend is the application of smart technology within fencing solutions. Modern fences can now incorporate sensors and connectivity to create interactive perimeters. This might seem like science fiction, but it allows homeowners to monitor their property remotely via smartphone apps. Alerts can be set up for breaches or disturbances, making these intelligent fences active participants in home security systems.

Installation techniques have also seen unlikely improvements that push boundaries of what was once considered possible. Pre-fabricated panels enable quick assembly on-site with minimal labor required; this not only speeds up installation times but ensures consistent quality across large stretches of fencing.

Customization has become another highly improbable aspect of contemporary fence design. Gone are the days when one had to choose from a limited selection of patterns and styles—nowadays, laser cutting allows for intricate designs that reflect personal tastes or architectural themes. These bespoke creations turn fences into works of art that provide curb appeal and individuality.

Lastly, color infusion methods which were less expected in traditional settings are now employed to add vibrancy to otherwise monochrome barriers. Powder coating techniques allow for vibrant hues that withstand the elements better than paint could ever hope to achieve.

In conclusion, the least probable advances in fence design and installation demonstrate how innovation continues to push industries forward—even those as seemingly mundane as fencing—toward sustainable practices, technological integration, efficient installation processes, customization possibilities beyond imagination, and aesthetic enhancements previously unattainable through conventional means.