So, with U44 came the first skill styles that provided a change in VFX rather than being a simple palette swap. Which presents the opportunity for more such skill style options in the future.
There are some skills that are quite noteworthy in players desire for something different (I.e. Flappy Bird), but what exactly would you like to see? What other skills would you like such a VFX change for (Be they non-class skills getting a class themed effect, or maybe a class skill getting an alternate theme) and what would you like the change to be?
Personally, there a couple of things I think would be neat;
1) Crow themed Nightblade skills - For example, rather than Blur being a bubble that makes you also look like you took a bath in some dayglow paint, it would instead surround you with a flock of crows (Much like the animation for the Witchmother's Whistle). Similarly, Mark Target could have crows flying around the target instead of the wisps of light.
2) A magical themed alternative to Caltrops - If I'm playing something like Arcanist/Templar Tank and want some Major Breach from Caltrops (THANKS SKILL SCRIBING FOR ALL THE 1 SOURCES OF IT), it can often feel kind of antithematic when all my skills are cool magical spells and effects and then there's just "I throw some spiky chunks of metal down" in the midst... So something like magical runes on the ground (In various class themed colours/designs) would be excellent.