Until that stupid decision is reversed, I stay with Snow Leopard.
At Work I have like 20 running Projects from different clients in the sidebar.
Each an everyone of em with a custom client-icon.
So I see at a glance which is which. Not so in Lion.
Common Guys, back to the medieval times? That's what icons are for.
Yes you can!
it does it for Finder
Here is for iTunes:
I have used and they work!
check this link out, it's a good workaround to this problem. i have MINIMAL experience doing this kind of thing but dared doing it & you know what ? it bleeding WORKS !!!
now as soon as i switch on my computer, all my sidebar icons are my custom, colored ones i had originally set - hurray !
this is the link :
http://forums.macrumors.com/showthread.php?t=1197960&page=5 check post nº 107 on page 5
have fun ;-)