Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857
Source Firkin
A frame using leaves from an image that was uploaded to Pixabay by mayapujiati
Source Firkin
Colourful background achieved with gradient fills.
Source Firkin
Found on the ground in french cafe in kunming, Yunnan, china
Source Rejon
Remixed from a drawing that was uploaded to Pixabay by ractapopulous
Source Firkin
Cubes as far as your eyes can see. You know, because they tile.
Source Jan Meeus
Prismatic Abstract Geometric Background derived from an image on Pixabay.
Source GDJ
A seamless gray background texture suitable for use on websites. To me, it has the look of stone. Feel free to modify it to meet your needs (by making it a bit lighter or darker, for example).
Source V. Hartikainen
A seamless pattern from a tile made from a jpg on Pixabay. To get the tile select the rectangle in Inkscape and use shift-alt-i.
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
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Floral patterns might not be the hottest thing right now, but you never know when you need it!
Source Lauren
A good starting point for a cardboard pattern. This would work well in a variety of colors.
Source Atle Mo
Prismatic Basic Pattern 2 No Background
Source GDJ
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
Light honeycomb pattern made up of the classic hexagon shape.
Source Federica Pelzel
After 1 comes 2, same but different. You get the idea.
Source Hendrik Lammers
This is the remix of "Background pattern 115" uploaded by "Firkin".Thanks.
Source Yamachem
This is sort of fresh, but still feels a bit old school.
Source Martuchox
A free background image with a seamless texture of cardboard. This texture of cardboard looks quite realistic, especially when is actually tiled.
Source V. Hartikainen
Seamless SVG vector and JPG backgrounds with faded diagonal stripes. The colors are editable.
Source V. Hartikainen
Background Wall, Art Abstract, white Well & CC0 texture.
Source Ractapopulous