It would be very handy if we had more track color variations to choose from.

Are you suggesting a larger display for colors, or more to choose from?
 
If you click other here

 
you get this

I'm not sure if this is what the OP meant, but I'd like previously used custom colors added to the list of standard color blocks.   Like Microsoft/Office apps. 
 

I agree Steve.  I guess we better vote at the top ...

Done!

Feel free to add your vote to this feature request post: customize the color palette

stickman393
Feel free to add your vote to this feature request post: customize the color palette

done!

There is SONAR mods , cakewalk forum post .

Why cant the person who make the mods, collaborate with Cakewalk
and send his theme's to them, he can get some benefits from cakewalk by making theme's.

Personally like to have it simple IMO and not having to use other programs to do so
having a lot of themes then it is simple to change the look of sonar, it certainly need some variation.

It is not just about the " colors " but the texture and shape, like wood, metal, knobs, switches etc
it is also important that buttons, etc clearly indicate if it is PRE or POST
" understanding of the visual's. "

( If a post button is green, we know it is in post mode, when it is in red then, it is in PRE mode
but it is even easier if the text on it change's to PRE, when it is red. )
 
Appearance is important.., not only for the users, but for new DAW buyers
" appearance sell " right ? 

stickman393
Feel free to add your vote to this feature request post: customize the color palette

I can't....     because I already had.  

I frequently assign 16 different colors to tracks and clips (6 from the new palette and 10 from the old palette's custom color section), so the new palette won't satisfy me if it becomes just customizable.  
http://forum.cakewalk.com/Add-a-custom-color-area-in-the-new-X32015-color-palette-m3202079.aspx#3202079