Made a tool that generates slider(art)s
Download links (Windows 64bit), better explanations here (osu! forum page)
It does what is said in title - generates potentially good looking sliders (and a lot of garbage that you need to skip). It can also either find proper SV so the slider will take as much time as you want or scale up / down slider without a need to change SV.
Also it can convert what you painted in the tool's area to slider (will mostly look like shit). You can even load image to draw on top of it so your slider will anyways look like a shit. (on forum page there is a link where i used image of star to outline it and converted it to actually +-good slider)
Posting this here too since osu! forum is dead af.