Hi,
I found some discussions that may be helpful to you:
https://community.qualtrics.com/XMcommunity/discussion/comment/21376
https://community.qualtrics.com/XMcommunity/discussion/comment/20037

Looks like while you cannot change the color of the graphic slider, you can use Javascript to display custom images (like sliders with blue bars) based on the slider selection.

@Tom_1842 You are always a saver, so let me ask you this: 

Do you know if there’s a JS in order to modify the scale of the graphic slider? instead of it to be 0 to 10 to only be 1 to 10 or at least prevent 0 from being selected (so if someone selecting 0 I will show an error?)

Hi @deveer2024 I gave it a try here!

OMG @Tom_1842 - you rock as always. I’m going to give it a try later today and will update! It seems elegant solution what you suggested!