Patterned tiled floor, what on the walls?

[Alcesalces]

I have chosen some gorgeous tiles for the bathroom floor

www.tiles-direct.com/wall-tiles-c26/kimono-tiles-c1401/kimono-mulitcolour-44-1cm-x-44-1cm-wall-floor-tile-p2508

I am then wondering what to have on the walls. Are there design rules I should follow regards this? I mean I know a second pattern would be overkill but what about the shape of the plain tiles?

Any advice?

Personally I'd have very plain tiles with patterned flooring. In this case, I'd pick out a colour from the floor and have plain tiles in that colour ie a blue or a stone colour. I wouldn't use white tiles in this case. I'd also try to match the grout to the tiles too.