Coloured stripes are a great way to make a pretty background, to use up loads of scraps and create some interest for your backgrounds from scratch. For these cards that the base with some added circles and squares, super simple but with a great effect.
(All supplies are linked to different stores at the end of this post in the thumbnails. The different stores are also linked behind the product name. Among them are affiliate links that may be used at no cost to you.)