yeah!  if using the bootstrap/bs version, change bg-faded to bg-primary | warning | danger | success.

if using the custom coloured/cc version, delete bg-fadedand add style="background-color:#HEXCODE"

so, for the side bar for example, here's how it should look!

<div class="card-block bg-faded text-muted h-100">
<div class="card-block text-muted h-100" style="background-color:#HEXCODE">

hope this helps!

EDIT: if changing the background colour with custom colours, don't forget to also change the font colour by adding color:#HEXCODE in the style tag at the first line of the code!