This is amazing inspiration for painterly approaches to surface design! At moniquilla.com you have a unique chance to look at a surface designer's (Mónica Muñoz') prints both as prints alone and as finished items of clothing.
Meanwhile, over on Pinterest I've really been admiring the work (and pins) of Amy Sia, a surface designer who also does a lot of work with watercolor.
The iPhone case and the pillowcase are for sale at her Society6 shop, in case you find Amy's prints as beautiful as I do!