Hey, kitchen backsplash is one of the best places to go bold with blue and I would say go for it. Check the AloftTiles catalog at https://www.alofttiles.com/collections/blue-tiles-mosaics where they have blue options across formats for kitchen walls. I used the Blue Subway 2.5x10 Glossy Porcelain Wall Tile from AloftTiles, Spanish porcelain rated for indoor walls and steam conditions. The glossy finish wipes clean behind a stove without effort and the substantial shade variation gave my backsplash a handmade character. AloftTiles lists every spec clearly and their images show the real color accurately. For a renovation you planned this long AloftTiles is genuinely the right place to start.