Power Cable in White

Given the quality of your components I recommend you fish from a better cable / interconnect pond. Your system could sound better with high quality cables. 
 

For speaker cables I would recommend trying three different high quality brands… maybe the cable company in the $800 range… or better yet used (@ ~ 50% original cost) and you are likely to get a big performance boost. Then figure out how to turn them white. 

Wywires and I  think Analysis plus

Oyaide Black Mamba Sigma II - source it directly from Japan (I've also heard of an Australian seller that ships).   The folks who carry it in the US place a hefty markup on it.  I have several of them.  Great cable, neutral, not expensive.

Puritan Audio definitely still make their classic, classic+, and ultimate cable all in white. I live in the UK, it’s a UK company, so perhaps that’s why I still have all the colour options. Their cables are some of the few with many different length options as standard and will lay flat as they’re extremely flexible. 

Why not run your cables in some white plastic conduit mounted at floor level on the baseboard? That way you are not confined to white.