I use slats from old wooden wine boxes to elevate my cables, just cut a groove and stand them up.
I notice that old French wine crates work best for European classical and California wine crates work best for American pieces.
Strangely enough some tests with beer cartons also made significant improvements. Budweiser Lite was good with Kenny G, whereas Becks set the proper mood for Lou Reed and John Cale.
Not surprising, Lone Star beer cartons were clearly superior with Hank WIlliams and even Johnny Cash.
Don't ask me to explain it, it's just the way the test turned out. Before I was an audiophile there was Bob Hope and Johnny Cash. After all these tweaks there is no hope and no cash.