i ordered custom css today and did some customization to a sandbox css i found here in the forums somewhere. It works so far (editing under linux with ff 18.104.22.168). Unfortunately Opera (Linux), Opera (Win), IE6 and FF (winXP, other machine) don't show the actual version. They show the previous version of the css just after i copied from the forums into the css editor.
check my blog at http://simplesnip.wordpress.com/. The header should be yellow and there should be a blue-ish background gradient (on top of the page). Also the sidebar should have yellow backgrounds behind the headers of the widgets.