This seamless pattern consists of a blue grid on a yellow background.
Source V. Hartikainen
To get the tile this is formed from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Abstract Stars Geometric Pattern Prismatic No Background
Source GDJ
Prismatic Abstract Background Design No Black
Source GDJ
From a drawing in 'Bond Slaves. The story of a struggle.', Isabella Varley, 1893.
Source Firkin
Could be paper, could be a Polaroid frame – up to you!
Source Chaos
This is so subtle you need to bring your magnifier!
Source Carlos Valdez
Prismatic Abstract Line Art Pattern Background
Source GDJ
Prismatic Hexagonalism Pattern No Background
Source GDJ
Nice little grid. Would work great as a base on top of some other patterns.
Source Arno Gregorian
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
A fun-looking elastoplast/band-aid pattern. A hint of orange tone in this one.
Source Josh Green
Abstract Arbitrary Geometric Background derived from an image on Pixabay.
Source GDJ
A lovely light gray pattern with stripes and a dash of noise.
Source V. Hartikainen
Prismatic Polka Dots Mark II No Background
Source GDJ
Alternative colour scheme for the original floral pattern.
Source Firkin
Formed by distorting a JPG from PublicDomainPictures
Source Firkin
This pack of filters can help you adding a blocky overlay to objects. May come handy at drawing blocks of stone.
Source Lazur URH
Lovely pattern with splattered vintage speckles.
Source David Pomfret
White fabric looking texture with some nice random wave features.
Source Hendrik Lammers
Background formed from the iconic plastic construction bricks that gave me endless hours of fun when I was a lad.
Source Firkin