I think variegated and cables can be a bit busy and you don't get the best effect of either. If you like the cables in the yarn you have, then go for it. Aside from personal taste there are exceptions to every rule.
Cheating is an option. . . . Cheaters never win and winners never cheat, but smart knitters who want to retain an iota of sanity do, cheerfully. ~~Kory Stamper