Where can I find graphics/illustrations like this, to make the background a bit less boring?

A collection of repeatable SVG background patterns

More than a million free vectors, PSD, photos and free icons. Exclusive freebies and all graphic resources that you need for your projects

Canva is a graphic-design platform with a drag-and-drop interface to create print or visual content while providing templates, images, and fonts. Canva makes graphic design more straightforward and accessible regardless of skill level.