First off no, I'm not complaining about them being sold at all. It is what it is.
However I do have a bit of feedback that may be useful just from the perspective of a highly fashion and character concept focused player:
I do not want to change just one skills color. I want an entire set of matching colors for the skill line. (Actually there's a fair chance I want the same color for all my skills)
I mention this not because I want you to make it one click for all the skills - there's times people are going to want to mix and match and it's great that that option exists! No, the problem is in how they're sold.
Say I want to make my melee attacks red. I can't just buy a pack of say... Two-Handed Skill Styles (Red) - with a red one for each skill in the line. Instead I have to just hope I catch the individual skill on the crown store or in a crate if it's not an unlock. That is a problem because I am never going to say... just turn one skill red, to stick with the example. Instead I'm either going to buy them individually and then, once I have the full collection, use them, or, much more likely, just ignore it because I'm not spending that kind of money piecemeal over weeks/months/possibly years just to put together a single full set of matching colors.
It's just a pain that makes players like me who might otherwise be willing to fork out go "Nevermind, that's too much of a hassle." - give me consolidated packs, please.
I will note there is room for one-offs when it's something like "Change your pet bear into a pet panther"; just, like for the color swaps? Yeah that should be in a pack that can cover the entire line.
Additional feedback for 'stuff I would buy if you made it less... frustrating'
Outfit slots - The price is so high and that they're per-character... it makes me, someone who usually will get every costume slot they can for a game whether it requires grinding or real money... it just turns me off entirely. I want to have costumes for each type of environment... but I'm not spending 15 dollars a pop per character do to that. Make them account wide on the other hand and I will give you money so fast you have no idea. - Or you could make it a gold sink, that could work too - SWTOR lets you buy costume slots with credits. FFXIV and WoW both just give them to you.
Finally a suggestion for a skill styles I'd love to see someday thanks to subclassing:
Daedric summons into animals (Ex: A monkey for the Scamp, a raptor or wolf of some sort for the Clannfear, maybe a large bird or large bird for the Winged Twilight?)
Likewise something daedric for the warden Bear pet.
Some of us (me, it's me) are excited about the idea of pet builds... but they're thematically going to be hard to consolidate at present. That said, seems like a good opportunity to me.
Just a thought.
Red Diamond, Red Diamond~ the Heart and Soul of Memes~