I don't want the icons to be longer, I want them to be less wide but the same height (I don't like the look of the small icons).
Here's an example of what part of my toolbar looks like right now:

I want it to look like this instead:

Yes, I know the spacing isn't consistent in this example, it's just a quick cutup job.
I hope everyone can see what I'm asking for now. Can this be done with WindowBlinds (with or without SkinStudio)?? Is there a skin available that does this already? I don't mind making my own skin, I just want to know if it's even possible to do.
By the way, this small example would allow me to have eight icons in the space of six. I have 20 apps currently pinned to my taskbar, so adjusting the width of the icons (for both pinned and running apps) would allow room for six or seven more than I can currently have without Windows creating a second row (which I also don't like).
Thanks for the replies so far!